Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
duong van » duong va, luong va, dang van
van thanh » ban thanh, van tuan
thanh tai » thanh hai, thanh toan, doanh tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sang) or (hieu lang)) - doanh doanh ((cua nhung) OR (va nhung)) duong van thanh tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - doanh doanh ((cua nhung) OR (va nhung)) duong van thanh tai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) or (hieu lang)) - doanh doanh ((cua nhung) OR (va nhung)) duong van thanh tai".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (hieu lang)) - doanh doanh ((cua nhung) OR (va nhung)) duong van thanh tai*.