Perhaps you should try some spelling variations:
canh doanh » hanh doanh, chinh doanh, doanh doanh
hieu lang » chieu sang, hieu quang, nhieu tang
cua phung » cua phuong, cua chung, cua thuong
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - canh doanh ((cua phung) OR (cua nhung)) cong dan van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu lang - canh doanh ((cua phung) OR (cua nhung)) cong dan van ban*".