Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
trinh cua » tinh cua, trinh luat, trinh luan
dang cong » dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chi) or (doc hieu)) sach - hanh ((trinh cua) or (trinh quan)) dang cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chi) OR (doc hieu)) sach - hanh ((trinh cua) OR (trinh quan)) dang cong san toan cao.
• Adding a wildcard symbol may retrieve word variants: ((doi chi) or (doc hieu)) sach - hanh ((trinh cua) or (trinh quan)) dang cong san toan cao*.