Perhaps you should try some spelling variations:
thanh tung » thanh cong
tuan trong » thuan trong, quan trong, tran trong
cua tinh » cua sinh, va tinh, hoa tinh
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
ha tinh » va tinh, may tinh

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

• If you are trying to use Boolean operators, they must be ALL CAPS: o ((ha tinh) OR (cua tinh)) - ((thanh trung) OR (thanh tung)) tuan trong cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "o ((ha tinh) or (cua tinh)) - ((thanh trung) OR (thanh tung)) tuan trong cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: o ((ha tinh) or (cua tinh)) - ((thanh trung) OR (thanh tung)) tuan trong cong tac toan cau*.