Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
doanh luan » doanh nhan
hieu lang » chieu sang, hieu quang, nhieu tang
luan dung » lan dung, luan dong, luan hung
dung cong » dung trong
nhanh bac » nhanh ha, nhanh va
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
nhan va » nhan tai, nhan dan, nhan tao

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - doanh doanh luan dung cong tan ((nhan va) or (nhanh bac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - doanh doanh luan dung cong tan ((nhan va) OR (nhanh bac)).
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - doanh doanh luan dung cong tan ((nhan va) or (nhanh bac))*.