Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
nhung cong » dung cong, thong cong, hang cong
hoc thien » hoc hien, hoc thieu, hoc thiet
anh nang » ganh nang, anh bang, anh dang
nang dua » nang du, nang suat, nang quan
dan toan » van toan, dan than, manh toan
dan chan » dan gian, dan ca, van chat

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: hoc thien thanh - anh nang dua ((nhung cong) OR (dung trong)) ((dan toan) OR (dan chan)) cao~.
• Adding a wildcard symbol may retrieve word variants: hoc thien thanh - anh nang dua ((nhung cong) or (dung trong)) ((dan toan) or (dan chan)) cao*.