Perhaps you should try some spelling variations:
hoang cong » hang cong, hoang long, hoang vuong
thanh dung » thanh duong, thanh tung, thanh hung
hieu lang » chieu sang, hieu quang, nhieu tang
van hoang » van hoan, quan hoang, tran hoang
dung van » duong van, dung va, dang van
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) or (hieu qua)) - thanh dung van hoang cong tan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu qua)) - thanh dung van hoang cong tan phan tu.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (hieu qua)) - thanh dung van hoang cong tan phan tu*.