Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
trung tuan » trung thanh, trung tam, tran tuan
tuan nhung » quan nhung, tuan hung, thuat nhung
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
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 ((chiet tach) or (hieu qua)) - thanh trung tuan nhung ((cong tan) OR (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chiet tach) OR (hieu qua)) - thanh trung tuan nhung ((cong tan) OR (cong san)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chiet tach) or (hieu qua)) - thanh trung tuan nhung ((cong tan) OR (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chiet tach) or (hieu qua)) - thanh trung tuan nhung ((cong tan) OR (cong san)) toan cau*.