Perhaps you should try some spelling variations:
thanh trung » thanh tung
thien hach » thien thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
trung tan » trung tuan, trung tran, trung tang
cong sang » cong lang, cong vang, cong bang
tan dung » tran dung, tin dung, van dung
cong san » cong tac
than cau » toan cau, phan cau, than cap

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 hach - thanh trung tan dung ((cong san) or (cong sang)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - thanh trung tan dung ((cong san) OR (cong sang)) than cau.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - thanh trung tan dung ((cong san) or (cong sang)) than cau*.