Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh tran » hanh trang, thanh tran, hanh tram
cong vang » cong lang, cong quang, cong ngang
thanh cha » thanh ha, thanh nha, thanh phan
tran van » luan van
van dung » van dong, xay dung, tin dung
cong van » cong san, song van, cong tan

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 sach) or (chiet tach)) - hanh tran van dung ((cong van) or (cong vang)) thanh cha~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chiet tach)) - hanh tran van dung ((cong van) OR (cong vang)) thanh cha.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chiet tach)) - hanh tran van dung ((cong van) or (cong vang)) thanh cha*.