Perhaps you should try some spelling variations:
thanh phuong » thanh huong, thanh chuong, khanh phong
hieu quan » hieu qua, lieu quan, thien quan
phuong va » thuong va, phong va, huong va
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
toc hieu » toc thieu, doc hieu, hoc thieu
tran van » luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc hieu quan - thanh phuong va ((hang cong) or (hang nong)) tran van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu quan - thanh phuong va ((hang cong) OR (hang nong)) tran van ban.
• Adding a wildcard symbol may retrieve word variants: toc hieu quan - thanh phuong va ((hang cong) or (hang nong)) tran van ban*.