Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu sach » chieu sach, hieu cach, dien sach
trung cap » truong cao, trung tam
cap nhung » cam nhung, vap nhung, dap nhung
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
cong tan » cong tac, cong thanh, cong ty
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sach - thanh trung cap nhung ((cong san) or (cong tan)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - thanh trung cap nhung ((cong san) OR (cong tan)) than cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - thanh trung cap nhung ((cong san) or (cong tan)) than cau*.