Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thien chanh » thien chinh, hien hanh, tien thanh
thanh trung » thanh tung
tam trong » nam trong, lam trong, pham trong
cong san » cong tac
than cau » toan cau, phan cau, than cap
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien thanh) or (thien chanh)) - thanh trung tam trong cong san ((than cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (thien chanh)) - thanh trung tam trong cong san ((than cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) or (thien chanh)) - thanh trung tam trong cong san ((than cau) or (toan cao))*.