Perhaps you should try some spelling variations:
thanh trung » thanh tung
khoi tinh » hoi tinh, khoi kinh, khoa tinh
khi tinh » khi sinh, kho tinh, thi tinh
trung va » truong va, trang va, trung ha
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
than man » than ma, thanh san, tran manh

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((khi tinh) OR (khoi tinh)) - thanh trung va nhung ((cong tan) or (cong san)) than man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((khi tinh) OR (khoi tinh)) - thanh trung va nhung ((cong tan) OR (cong san)) than man.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((khi tinh) OR (khoi tinh)) - thanh trung va nhung ((cong tan) or (cong san)) than man".
• Adding a wildcard symbol may retrieve word variants: doi ((khi tinh) OR (khoi tinh)) - thanh trung va nhung ((cong tan) or (cong san)) than man*.