Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tran » thanh trang, thanh toan, thanh tra
van nhuong » van chuong, van phuong, van huong
hoc thieu » toc thieu, hoc hien
van phung » van phong, van hung, van chuong
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

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 xanh - thanh tran ((van phung) OR (van nhuong)) cong ((dan than) OR (van than)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh tran ((van phung) or (van nhuong)) cong ((dan than) OR (van than)) cao~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh tran ((van phung) or (van nhuong)) cong ((dan than) OR (van than)) cao*.