Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, nhieu tang, hieu van
tran hong » tran hoang, tran trong, tranh hang
van nhung » van nhuong, va nhung, van hung
hong van » hoang van, thong van, phong van
cong ban » cong bang, cong san, cong tan
hang cau » hang ca, nhung cau, nang cao
hang dau » hang va, hang tai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (hieu quang)) - tran hong van nhung cong ban ((hang cau) OR (hang dau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) or (hieu quang)) - tran hong van nhung cong ban ((hang cau) OR (hang dau))~".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (hieu quang)) - tran hong van nhung cong ban ((hang cau) OR (hang dau))*.