Perhaps you should try some spelling variations:
doanh tran » doanh tren, doanh thanh, doanh trong
quang hung » quang dung, quang phuong, quang trung
hieu lang » chieu sang, hieu quang, nhieu tang
hung cong » nhung cong, hung cuong, phung cong
nhanh cay » nhanh ha, nhanh va, hanh cac
nhanh bac » nhanh ha, nhanh va
hoc hieu » hoc thieu, hoc hien, doc hieu
cong ban » cong bang, cong san, cong tan

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 tran quang hung cong ban ((nhanh cay) or (nhanh bac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - doanh tran quang hung cong ban ((nhanh cay) OR (nhanh bac)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - doanh tran quang hung cong ban ((nhanh cay) or (nhanh bac))*.