Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
dung dang » dung dan, dung dong, dung danh
doanh va » doan va, doanh tai, doanh cua
dang van » hoang van, hang va
van tuan » van quan, van ban, anh tuan
tuan tap » toan tap, tuan tai, tuyen tap
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi ((hieu lang) or (hieu quang)) - doanh doanh va dung dang van tuan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu lang) OR (hieu quang)) - doanh doanh va dung dang van tuan tap.
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu lang) or (hieu quang)) - doanh doanh va dung dang van tuan tap*.