Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
cong thanh » dong thanh, cong tan, truong thanh
nhan dang » nhan dan, phan dang, tran dang
toan cau » toan cao, toan ban, toan tap
vua ban » qua ban, va ban, vu ban

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 chieu xanh - nhan dang ((vua ban) OR (cua ban)) ((cong thanh) OR (cong trinh)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - nhan dang ((vua ban) or (cua ban)) ((cong thanh) OR (cong trinh)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - nhan dang ((vua ban) or (cua ban)) ((cong thanh) OR (cong trinh)) toan cau*.