Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
trung ca » trung cap, truong ca, trung cua
ca thong » ca thuong, va thong, ca trong
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
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: ((hoc hien) OR (theo chieu)) tinh - thanh trung ca thong ((cong dan) OR (cong tan)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hien) or (theo chieu)) tinh - thanh trung ca thong ((cong dan) OR (cong tan)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (theo chieu)) tinh - thanh trung ca thong ((cong dan) OR (cong tan)) toan cau*.