Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
doanh cua » doanh luan
dung cong » dung trong
doan phan » doanh phan, toan phan, dan phan
doi hieu » doi chieu, doc hieu, doi hien
manh cua » ban cua
dam phan » d phan, va phan, van phan

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 - canh ((manh cua) or (doanh cua)) dung cong ((dam phan) or (doan phan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - canh ((manh cua) OR (doanh cua)) dung cong ((dam phan) OR (doan phan)) cau.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - canh ((manh cua) or (doanh cua)) dung cong ((dam phan) or (doan phan)) cau*.