Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
lanh manh » lanh tranh, lan anh, van manh
cua trong » cua truong, cua trung, qua trong
thanh cha » thanh ha, thanh nha, thanh phan
doi hieu » doi chieu, doc hieu, doi hien
manh cua » doanh cua, ban cua
cong tan » cong tac, cong san, cong thanh
khan cap » khan ap, than cap, khoan cam

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 - lanh manh cua trong cong tan ((thanh cha) OR (khan cap))~.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - lanh manh cua trong cong tan ((thanh cha) or (khan cap))*.