Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
theo chu » theo chieu, cho chu, chao chu
chu xanh » chu manh, chieu xanh, chua xang
trang va » tran van, hang va
cong tan » cong tac, cong san, cong ty
toan cau » toan cao, toan ban, toan tap
tang va » tang van, thang va, tang vat

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