Perhaps you should try some spelling variations:
doanh sang » doanh quang, doanh ban, doanh van
theo dieu » theo tieu, theo chieu, thuoc dieu
lanh bang » anh bang, lanh sang, can bang
hang cong » dang cong, hang nong, bang cong
cong dan » cong san, cong tan, huong dan
va hang » van hang, va nang, va lang
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: theo dieu hanh - ((lanh bang) or (doanh sang)) va hang cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo dieu hanh - ((lanh bang) OR (doanh sang)) va hang cong dan van ban.
• Adding a wildcard symbol may retrieve word variants: theo dieu hanh - ((lanh bang) or (doanh sang)) va hang cong dan van ban*.