Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
cong lang » cong vang, cong luong, cong quang
lang than » lang thang, lang thanh, sang than
than cao » toan cao, thai cao, than cap
va hang » van hang, va lang, va hanh
va nang » van nang, da nang, cam nang

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 sach - ((canh tranh) OR (thanh tung)) ((va hang) OR (va nang)) cong lang than cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - ((canh tranh) or (thanh tung)) ((va hang) OR (va nang)) cong lang than cao~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((canh tranh) or (thanh tung)) ((va hang) OR (va nang)) cong lang than cao*.