coreseek 英文搜索时将关键词切断的问题

环境： RHEL 5.5 x64
Coreseek Fulltext 3.2 [ Sphinx 0.9.9-release (r2117)]

问题现象：
[root@wiki mnt]# search category
Coreseek Fulltext 3.2 [ Sphinx 0.9.9-release (r2117)]
Copyright (c) 2007-2010,
Beijing Choice Software Technologies Inc ()

 using config file '/usr/local/coreseek/etc/csft.conf'...
index 'wiki_main': query 'category ': returned 1000 matches of 1735 total in 0.065 sec

displaying matches:
1. document=7368, weight=2, page_namespace=10, old_id=43577
        page_title=Category
        page_namespace=10
2. document=1, weight=1, page_namespace=0, old_id=29556
        page_title=??
        page_namespace=0
3. document=2, weight=1, page_namespace=0, old_id=12858
        page_title=Current_events
        page_namespace=0
4. document=4, weight=1, page_namespace=0, old_id=12943
        page_title=Kernel
        page_namespace=0
5. document=21, weight=1, page_namespace=0, old_id=9300
        page_title=PF
        page_namespace=0
6. document=23, weight=1, page_namespace=0, old_id=18011
        page_title=Packages
        page_namespace=0
7. document=38, weight=1, page_namespace=0, old_id=3333
        page_title=LDAP
        page_namespace=0
8. document=41, weight=1, page_namespace=4, old_id=24189
        page_title=??
        page_namespace=4
9. document=43, weight=1, page_namespace=0, old_id=44245
        page_title=Wik-backup
        page_namespace=0
10. document=70, weight=1, page_namespace=0, old_id=13103
        page_title=????
        page_namespace=0
11. document=246, weight=1, page_namespace=0, old_id=44269
        page_title=??
        page_namespace=0
12. document=252, weight=1, page_namespace=12, old_id=24174
        page_title=???????
        page_namespace=12
13. document=258, weight=1, page_namespace=12, old_id=24178
        page_title=??
        page_namespace=12
14. document=263, weight=1, page_namespace=12, old_id=24191
        page_title=????
        page_namespace=12
15. document=271, weight=1, page_namespace=12, old_id=24177
        page_title=????
        page_namespace=12
16. document=273, weight=1, page_namespace=12, old_id=24180
        page_title=???
        page_namespace=12
17. document=294, weight=1, page_namespace=0, old_id=41390
        page_title=Administrators
        page_namespace=0
18. document=300, weight=1, page_namespace=0, old_id=18219
        page_title=??
        page_namespace=0
19. document=308, weight=1, page_namespace=0, old_id=795
        page_title=???SSL_VPN
        page_namespace=0
20. document=331, weight=1, page_namespace=0, old_id=840
        page_title=??
        page_namespace=0

words:
1. 'categori': 1735 documents, 2645 hits

index 'wiki_incremental': query 'category ': returned 1 matches of 1 total in 0.007 sec

displaying matches:
1. document=409, weight=1, page_namespace=0, old_id=44398
        page_title=OpenBSD??OpenSSH??SSH???
        page_namespace=0

words:
1. 'categori': 1 documents, 3 hits

[root@wiki mnt]#

搜索中文正常

[root@wiki mnt]# search 归档日志
Coreseek Fulltext 3.2 [ Sphinx 0.9.9-release (r2117)]
Copyright (c) 2007-2010,
Beijing Choice Software Technologies Inc ()

 using config file '/usr/local/coreseek/etc/csft.conf'...
index 'wiki_main': query '归档日志 ': returned 390 matches of 390 total in 0.011 sec

displaying matches:
1. document=9073, weight=2, page_namespace=0, old_id=27422
        page_title=RMAN????????RMAN-06059??????
        page_namespace=0
2. document=9163, weight=2, page_namespace=0, old_id=30658
        page_title=?????????????
        page_namespace=0
3. document=10660, weight=2, page_namespace=0, old_id=20002
        page_title=?????????????????????
        page_namespace=0
4. document=10872, weight=2, page_namespace=0, old_id=44284
        page_title=??????????????
        page_namespace=0
5. document=15395, weight=2, page_namespace=0, old_id=36425
        page_title=Oracle???????????
        page_namespace=0
6. document=16402, weight=2, page_namespace=0, old_id=31181
        page_title=????DG???????
        page_namespace=0
7. document=16785, weight=2, page_namespace=0, old_id=44270
        page_title=Oracle_10g_???????????
        page_namespace=0
8. document=16798, weight=2, page_namespace=0, old_id=32039
        page_title=Oracle_10g_?????Archive_Log_?
        page_namespace=0
9. document=17508, weight=2, page_namespace=0, old_id=33279
        page_title=?restore_archivelog???????????
        page_namespace=0
10. document=17746, weight=2, page_namespace=0, old_id=44273
        page_title=RMAN??????????
        page_namespace=0
11. document=18224, weight=2, page_namespace=0, old_id=34858
        page_title=RMAN???????????????
        page_namespace=0
12. document=324, weight=1, page_namespace=0, old_id=43429
        page_title=A??????????