Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
thanh tung » thanh cong
cong quang » luong quang, thong quang, duong quang
quang than » quang thanh, quang thang, quang tuan
chua dong » cua dong, ha dong, huy dong
dong cong » duong cong, dung cong, dang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
than cap » khan cap, thanh lap, thanh cac

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 nganh - ((thanh trung) or (thanh tung)) chua dong cong quang than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu nganh - ((thanh trung) OR (thanh tung)) chua dong cong quang than cap.
• Adding a wildcard symbol may retrieve word variants: hoc hieu nganh - ((thanh trung) or (thanh tung)) chua dong cong quang than cap*.