Perhaps you should try some spelling variations:
hanh tranh » hanh trinh, hanh trang, lanh tranh
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan tap » toan ban

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

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