Perhaps you should try some spelling variations:
cdoanh van » doan van, doanh va, doanh ban
doanh van » doan van, doanh va, doanh ban
hoc hieu » hoc thieu, hoc hien, doc hieu
hieu cua » hieu qua, dieu cua, bieu cua
cua tong » cua cong, cua dong, cua nong
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 cua - ((cdoanh van) or (doanh van)) ((suat thong) or (cua tong)) cong tan tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cua - ((cdoanh van) OR (doanh van)) ((suat thong) OR (cua tong)) cong tan tran cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu cua - ((cdoanh van) or (doanh van)) ((suat thong) or (cua tong)) cong tan tran cau*.