Perhaps you should try some spelling variations:
truong quan » trong quan, thong quan, luong quan
hanh truong » hanh trong, anh truong, manh truong
quan trong » gian trong
doc hieu » hoc thieu, hoc hien
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan tap » toan ban

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 (toc thieu)) sang - hanh truong quan trong cong san toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) sang - hanh truong quan trong cong san toan tap.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) sang - hanh truong quan trong cong san toan tap*.