Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu cach » hieu cac, chieu sach, hieu ca
hoc hieu » hoc thieu, hoc hien, doc hieu
tranh va » tranh van, trang va, trinh va
cong tan » cong tac, cong san, cong thanh
than cau » phan cau, thanh chau, thanh mau
than cap » khan cap, thanh lap, thanh cac
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 hieu cach - canh tranh va nhung cong tan ((((than cau) or (than cap))) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - canh tranh va nhung cong tan ((((than cau) OR (than cap))) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - canh tranh va nhung cong tan ((((than cau) or (than cap))) or (toan cau))*.