Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hieu lang » chieu sang, hieu quang, nhieu tang
hoc hieu » hoc thieu, hoc hien, doc hieu
vat dung » van dung, viet dung, mat duong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
va dung » van dung, va duong, va ung

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: "hoc hieu lang - hanh trang ((va dung) OR (vat dung)) cong dan than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh trang ((va dung) OR (vat dung)) cong dan than cau*.