Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thanh tung » thanh cong
cong thanh » dong thanh, cong trinh, truong thanh
hieu lang » chieu sang, nhieu tang, hieu van
van hoang » van hoan, quan hoang, tran hoang
tung van » trung van, tang van, dung van
cong tan » cong tac, cong san, cong ty

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 quang)) - thanh tung van hoang ((cong tan) OR (cong thanh)) phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - thanh tung van hoang ((cong tan) OR (cong thanh)) phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (hieu quang)) - thanh tung van hoang ((cong tan) OR (cong thanh)) phan tu".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (hieu quang)) - thanh tung van hoang ((cong tan) OR (cong thanh)) phan tu*.