Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, dieu hanh
bang cong » bang song, hang cong, dung cong
dang cong » dung cong
anh dung » anh huong, sach dung, ung dung
anh dong » anh huong, anh son
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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 tieu xanh - ((anh dung) OR (anh dong)) chua ((bang cong) OR (dang cong)) van toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - ((anh dung) or (anh dong)) chua ((bang cong) OR (dang cong)) van toan cao~".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - ((anh dung) or (anh dong)) chua ((bang cong) OR (dang cong)) van toan cao*.