Perhaps you should try some spelling variations:
thong tuong » thong thuong, thong thong, thong duong
hieu quang » thieu quang, hieu quan, diep quang
nhanh mang » nhanh lang, hanh 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
mang va » mang vua, hang va, bang va

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "nho ((hieu quang) OR (hieu qua)) - nhanh mang va thong tuong doan van ban~".
• Adding a wildcard symbol may retrieve word variants: nho ((hieu quang) OR (hieu qua)) - nhanh mang va thong tuong doan van ban*.