Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tieu xanh » tieu danh, chieu xanh, dieu hanh
trong van » trong cac
tang van » dang van, hoang van, tang luan
cong tac » cong ty
toan cau » toan ban, toan tap, toan tai
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 - hanh ((tang van) OR (trong van)) nhung cong tac ((toan cau) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - hanh ((tang van) OR (trong van)) nhung cong tac ((toan cau) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - hanh ((tang van) OR (trong van)) nhung cong tac ((toan cau) or (toan cao))*.