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
than cua » nhan cua, thai cua, ban cua
mang cua » manh cua, dung cua, ban cua
cong tan » cong tac, cong san, cong thanh
tran cau » tran chau, toan cau, ran cau

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 - hanh ((than cua) or (mang cua)) nhung cong tan tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - hanh ((than cua) OR (mang cua)) nhung cong tan tran cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - hanh ((than cua) or (mang cua)) nhung cong tan tran cau*.