Perhaps you should try some spelling variations:
thanh tung » thanh cong
thong cong » trong cong, tong cong, thong thong
bien tinh » bi tinh, yen tinh, diep tinh
cua thong » cua thuong, cua khong, cua tong
cong tac » cong ty
chan cau » can cau, chinh cau, nhanh cau
phan cau » phan dau, phan cac, phan tu
so bien » mot bien

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

• Performing a fuzzy search may retrieve terms with similar spellings: so bien tinh - ((thanh trung) or (thanh tung)) cua thong cong tac ((chan cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so bien tinh - ((thanh trung) OR (thanh tung)) cua thong cong tac ((chan cau) OR (phan cau)).
• Adding a wildcard symbol may retrieve word variants: so bien tinh - ((thanh trung) or (thanh tung)) cua thong cong tac ((chan cau) or (phan cau))*.