Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
doanh quang » doan quang, doanh quan, doanh luan
quang dung » quang trung, ung dung, cuong dung
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
nhanh bac » nhanh ha, nhanh va
hoc hieu » hoc thieu, hoc hien, doc hieu
cong ban » cong bang, cong san, cong tan
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: hoc hieu lang - doanh doanh quang dung cong ban ((nhan va) or (nhanh bac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - doanh doanh quang dung cong ban ((nhan va) OR (nhanh bac)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - doanh doanh quang dung cong ban ((nhan va) or (nhanh bac))*.