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
trong van » trong cac
doanh va » doan va, doanh tai, doanh cua
va dung » van dung, va duong, vat dung
van tan » van tuan, van ban, van tai
tan tap » toan tap, han tap, tan tat

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 trong van tan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu lang) OR (hieu quang)) - doanh doanh va dung trong van tan tap.
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu lang) or (hieu quang)) - doanh doanh va dung trong van tan tap*.