Perhaps you should try some spelling variations:
hanh tranh » hanh trinh, hanh trang, lanh tranh
dung cong » dung trong
theo hoi » theo doi, theo hop, theo duoi
hoi lang » hoa lang, hoi dan
van toan » van tuan, van tan, van thanh
dan than » dan chan, ban than, van than
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hoi lang - ((hanh tranh) or (canh tranh)) va dung cong ((van toan) or (dan than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hoi lang - ((hanh tranh) OR (canh tranh)) va dung cong ((van toan) OR (dan than)) cao.
• Adding a wildcard symbol may retrieve word variants: theo hoi lang - ((hanh tranh) or (canh tranh)) va dung cong ((van toan) or (dan than)) cao*.