Perhaps you should try some spelling variations:
thien chanh » thien thanh, thien chinh, hien hanh
thanh trung » thanh tung
thien anh » thien danh, tien anh, thien thanh
tam trong » nam trong, lam trong, pham trong
cong san » cong tac
phan dau » phan tu, hang dau
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 anh) or (thien chanh)) - thanh trung tam trong cong san ((phan dau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien anh) OR (thien chanh)) - thanh trung tam trong cong san ((phan dau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thien anh) or (thien chanh)) - thanh trung tam trong cong san ((phan dau) or (toan cao))*.