Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhieu tang » chieu sang, hieu lang, nhiet nang
nhung cong » dung cong, thong cong, hang cong
hanh hang » thanh hang, hang hang, hanh han
tan thanh » tran thanh, tang thanh, toan thanh
thanh ban » thanh san, thanh van, thanh bac
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chiet tach) or (nhieu tang)) - hanh hang va nhung cong tan thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chiet tach) OR (nhieu tang)) - hanh hang va nhung cong tan thanh ban.
• Adding a wildcard symbol may retrieve word variants: doi ((chiet tach) or (nhieu tang)) - hanh hang va nhung cong tan thanh ban*.