Perhaps you should try some spelling variations:
theo chu » theo chieu, cho chu, chao chu
chu xanh » chu manh, chieu xanh, chua xang
trang va » hang va
tran van » luan van
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
than cao » toan cao, thai cao, than cap

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 - anh ((trang va) OR (tran van)) nhung ((cong dan) OR (cong tan)) than cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu xanh - anh ((trang va) OR (tran van)) nhung ((cong dan) or (cong tan)) than cao~".
• Adding a wildcard symbol may retrieve word variants: theo chu xanh - anh ((trang va) OR (tran van)) nhung ((cong dan) or (cong tan)) than cao*.