Perhaps you should try some spelling variations:
thanh trung » thanh tung
tam thong » tam thuong, nam thong, tac thong
tao thong » tao trong, giao thong, toan thong
theo kha » theo phap, thao khoa, theo chu
kha nang » phap nang, ky nang, ki nang
cong dan » cong san, cong tan, huong dan
toan cau » toan cao, toan ban, toan tap

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 kha nang - thanh trung ((tam thong) OR (tao thong)) cong dan ((toan cau) OR (van ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo kha nang - thanh trung ((tam thong) OR (tao thong)) cong dan ((toan cau) or (van ban))~".
• Adding a wildcard symbol may retrieve word variants: theo kha nang - thanh trung ((tam thong) OR (tao thong)) cong dan ((toan cau) or (van ban))*.