Perhaps you should try some spelling variations:
lang thang » cang thang, dang thanh, hung thang
quan trong » gian trong
cong doanh » cong danh, cong doan, dong doanh
doanh phan » doanh nhan, doan phan, doanh thanh
hieu lang » chieu sang, hieu quang, nhieu tang
doc hieu » toc thieu, hoc thieu, hoc hien
lang van » dang van, tang van, hoang 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 - ((lang van) OR (lang thang)) quan trong cong doanh phan tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu lang - ((lang van) OR (lang thang)) quan trong cong doanh phan tu*".