Perhaps you should try some spelling variations:
thanh nhung » thanh hung, hanh nhung, tranh nhung
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
manh trung » manh tung, manh hung, hanh trang
cong tac » cong ty
tac nang » tac vang, tai nang, tap nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - ((manh trung) OR (sinh trung)) ((thanh nhung) or (thanh trung)) cong tac nang cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - ((manh trung) OR (sinh trung)) ((thanh nhung) OR (thanh trung)) cong tac nang cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - ((manh trung) OR (sinh trung)) ((thanh nhung) or (thanh trung)) cong tac nang cao".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - ((manh trung) OR (sinh trung)) ((thanh nhung) or (thanh trung)) cong tac nang cao*.