Perhaps you should try some spelling variations:
hoc chinh » hoan chinh, hoc sinh, hoc kinh
hang cong » dang cong, hang nong, bang cong
tranh va » tranh van, trang va, thanh va
trinh va » trinh van, trinh vat, trinh ve
cong tac » cong ty
than cau » phan cau, than cap, thanh chau
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: hoc chinh sach - canh ((tranh va) or (trinh va)) hang cong tac ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chinh sach - canh ((tranh va) OR (trinh va)) hang cong tac ((than cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: hoc chinh sach - canh ((tranh va) or (trinh va)) hang cong tac ((than cau) or (toan cau))*.