Perhaps you should try some spelling variations:
thong tuong » thong thuong, thong thong, thong duong
hieu quang » thieu quang, hieu quan, diep quang
nhanh bang » nhanh lang, nhanh mang, nhanh quang
tuong doan » tuong dan, trong doanh, phuong doan
va thong » va thuong, va phuong, he thong
doan van » doan va, hoang van, luan van
bang va » hang va, ban va, trang va

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: nho ((hieu quang) OR (hieu qua)) - nhanh bang va thong tuong doan van ban~.
• Adding a wildcard symbol may retrieve word variants: nho ((hieu quang) or (hieu qua)) - nhanh bang va thong tuong doan van ban*.