Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
vat dung » van dung, viet dung, mat duong
toan cao » toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu
va dung » van dung, va duong, va ung

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: ho hieu lang - ((thanh trung) OR (thanh tung)) ((va dung) OR (vat dung)) cong manh toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - ((thanh trung) or (thanh tung)) ((va dung) OR (vat dung)) cong manh toan cao~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((thanh trung) or (thanh tung)) ((va dung) OR (vat dung)) cong manh toan cao*.