Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
tranh va » tranh van, trang va, trinh va
cong tac » cong ty
phan cau » phan dau, phan cac, phan tu
toan cau » 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: ho ((chieu sach) or (hieu quang)) - canh tranh va nhung cong tac ((phan cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (hieu quang)) - canh tranh va nhung cong tac ((phan cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (hieu quang)) - canh tranh va nhung cong tac ((phan cau) or (toan cau))*.