Perhaps you should try some spelling variations:
quan trong » gian trong
tan doanh » toan doanh, van doanh, san doanh
doanh cao » doanh co, doanh bao, doanh cho
doc hieu » toc thieu, hoc thieu
hanh ban » thanh ban, hang ban, hanh san
ban quan » van quan
cong tan » cong tac, cong san, cong thanh

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) or (hoc hien)) sang - hanh ban quan trong cong tan doanh cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) sang - hanh ban quan trong cong tan doanh cao.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc hien)) sang - hanh ban quan trong cong tan doanh cao*.