Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
hanh tran » hanh trang, thanh tran, hanh tram
tran van » luan van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - hanh tran van ((nhung cong) or (thong thong)) van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh tran van ((nhung cong) OR (thong thong)) van toan cao.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh tran van ((nhung cong) or (thong thong)) van toan cao*.