Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung tuan » trung thanh, trung tam, tran tuan
bang cong » dang cong, bang song, dung cong
hang cong » dang cong, hang nong, thanh cong
ho trieu » mot trieu, 25 trieu, ho chieu
30 trieu » 25 trieu
tac toan » tap toan, tam toan, hach toan
toan cau » 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: ((ho trieu) or (30 trieu)) tinh - thanh trung tuan ((bang cong) or (hang cong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho trieu) OR (30 trieu)) tinh - thanh trung tuan ((bang cong) OR (hang cong)) tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ((ho trieu) or (30 trieu)) tinh - thanh trung tuan ((bang cong) or (hang cong)) tac toan cau*.