Perhaps you should try some spelling variations:
thanh tung » thanh cong
cong thanh » dong thanh, cong trinh, truong thanh
yen tinh » tuyen tinh
va thong » va thuong, va phuong, he thong
cong tan » cong tac, cong san, cong ty
toan tap » toan ban
co yen » co nen, o yen, ca yen

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

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