Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
hoc thieu » toc thieu
nang cong » nang song, bang cong, hang cong
dang cong » dung cong
manh toan » thanh toan, anh tuan, tinh toan
tran van » luan van
toan tap » toan ban

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 thieu) OR (hoc hien)) xanh - thanh tran van ((nang cong) OR (dang cong)) manh toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (hoc hien)) xanh - thanh tran van ((nang cong) OR (dang cong)) manh toan tap~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (hoc hien)) xanh - thanh tran van ((nang cong) OR (dang cong)) manh toan tap*.