Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh hang » thanh hang, hang hang, hanh han
doi hieu » doi chieu, doc hieu, doi hien
van dang » van dong, van dung, van nang
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan tu » phan tu, han tu, chon tu

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: doi hieu lang - hanh hang ((van dang) OR (cam nang)) cong dan chan tu~.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh hang ((van dang) or (cam nang)) cong dan chan tu*.