Perhaps you should try some spelling variations:
dung quan » dung quang, dung luan, luong quan
hieu luat » hieu qua
tinh dung » trinh dung, tinh quang, tinh huong
quan quan » quan quang, qua quan, quan luan
quan van » luan van, quan va, quan luan
van hieu » cao hieu
quan den » quan doan, quan he, quan doi
den hoc » dien hoc, dan hoc, de hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin dung quan van hieu luat ) or ( tinh dung quan quan den hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung quan van hieu luat ) OR ( tinh dung quan quan den hoc ))*.