Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
nang cong » nang song, dang cong, bang cong
manh toan » thanh toan, anh tuan, tinh toan
ho chiet » ho chieu, hoc thiet, hoa thiet
ho thiet » hoc thiet, hoa thiet, so thiet
tran van » luan van
van nang » van quang, van ban, van dong
dan toan » van toan, dan than, xuan toan

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: ((ho chiet) OR (ho thiet)) tach - thanh tran van nang cong ((dan toan) OR (manh toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chiet) or (ho thiet)) tach - thanh tran van nang cong ((dan toan) OR (manh toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho chiet) or (ho thiet)) tach - thanh tran van nang cong ((dan toan) OR (manh toan)) cau*.