Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
theo phap » thi phap
phap tinh » phap sinh, phap tieng, phap tang
dung cong » dung trong
nang dua » nang du, nang suat, nang quan
dan toan » van toan, dan than, manh toan
toan tap » toan ban
ban cua » ban quan

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: theo phap tinh - anh ((ban cua) OR (nang dua)) ((nhung cong) OR (dung cong)) dan toan tap~.
• Adding a wildcard symbol may retrieve word variants: theo phap tinh - anh ((ban cua) or (nang dua)) ((nhung cong) or (dung cong)) dan toan tap*.