Perhaps you should try some spelling variations:
thanh trinh » hanh trinh, thanh tinh, thanh binh
chieu tinh » trieu tinh, lieu tinh, chau tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
hang cong » dang cong, hang nong, bang cong
cong tac » cong ty
phan dau » phan tu, hang dau
phan cac » nhan cach, phan lap, phan van
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu tinh - ((thanh trinh) or (canh tranh)) va hang cong tac ((phan dau) or (phan cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu tinh - ((thanh trinh) OR (canh tranh)) va hang cong tac ((phan dau) OR (phan cac)).
• Adding a wildcard symbol may retrieve word variants: hoc chieu tinh - ((thanh trinh) or (canh tranh)) va hang cong tac ((phan dau) or (phan cac))*.