Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tang » hanh trang, anh tang, hanh mang
cua trong » cua truong, cua trung, qua trong
doi hieu » doi chieu, doc hieu, doi hien
tang cua » mang cua, hang cua, tang luan
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh
hang cau » hang dau, hang ca, nhung cau

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 tang cua trong ((cong ban) OR (cong tan)) ((hang cau) OR (nhu cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - hanh tang cua trong ((cong ban) OR (cong tan)) ((hang cau) or (nhu cau))~".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh tang cua trong ((cong ban) OR (cong tan)) ((hang cau) or (nhu cau))*.