Perhaps you should try some spelling variations:
tang luan » dung luan
theo chu » theo chieu, cho chu, chao chu
chu xanh » chu manh, chieu xanh, chua xang
tang cua » mang cua, hang cua, thong cua
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
toan cau » 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 chu xanh - hanh ((tang cua) OR (tang luan)) nhung ((cong dan) OR (cong tac)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu xanh - hanh ((tang cua) OR (tang luan)) nhung ((cong dan) or (cong tac)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo chu xanh - hanh ((tang cua) OR (tang luan)) nhung ((cong dan) or (cong tac)) toan cau*.