Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, thien hach, hieu cach
dai duong » dai cuong, hai duong, dai luong
dan dung » van dung, tin dung, ap dung
cong tan » cong tac, cong san, cong thanh
van chat » cao chat
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu sach - thanh trung ((dan dung) or (dai duong)) cong tan van chat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sach - thanh trung ((dan dung) OR (dai duong)) cong tan van chat.
• Adding a wildcard symbol may retrieve word variants: toc thieu sach - thanh trung ((dan dung) or (dai duong)) cong tan van chat*.