Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
cong thanh » dong thanh, cong trinh, cong tan
tranh vat » trinh vat, tranh va, tranh van
dung cong » dung trong
dat sach » mat sach, dat khach, ban sach
nam sach » ngan sach, nam danh, nam sao
vat dung » van dung, va dung, viet dung
tran cau » tran chau, toan cau, ran cau

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((dat sach) OR (nam sach)) - canh tranh vat dung cong thanh tran cau~".
• Adding a wildcard symbol may retrieve word variants: theo ((dat sach) OR (nam sach)) - canh tranh vat dung cong thanh tran cau*.