Perhaps you should try some spelling variations:
thang quan » thong quan, tang quan, hang quan
cang thang » cong thanh, dang thanh
quan trong » gian trong
ho chieu » theo chieu, hoc thieu, mot chieu
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than ban » thanh ban, toan ban, than man

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (theo tieu)) sach - cang thang quan trong cong tan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo tieu)) sach - cang thang quan trong cong tan than ban.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo tieu)) sach - cang thang quan trong cong tan than ban*.