Perhaps you should try some spelling variations:
phuong thong » phuong trong, thong thong, phuong hoang
hieu quan » hieu qua, lieu quan, thien quan
thanh van » thanh san, thanh toan, thanh phan
thong dan » thong van, tuong dan, thong den
ho hieu » ho chieu, hoi hieu, nho hieu
dan van » dang van, doan van, dao van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu quan - nhanh ((thanh van) or (tinh toan)) phuong thong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quan - nhanh ((thanh van) OR (tinh toan)) phuong thong dan van ban*.