Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
cong manh » cong danh, duong manh, cong thanh
doi hieu » doi chieu, doc hieu, doi hien
hanh ban » thanh ban, hang ban, hanh san
cua dang » cua cong, cua ban
toan tap » toan ban
ban cua » ban quan

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 ban cua dang ((cong manh) or (cong trinh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - hanh ban cua dang ((cong manh) OR (cong trinh)) toan tap.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh ban cua dang ((cong manh) or (cong trinh)) toan tap*.