Perhaps you should try some spelling variations:
trinh thong » trinh thuong, trinh trong, trinh tong
tinh dung » trinh dung, tin dung, tinh quang
hieu luat » hieu qua
bien soan » bien so
quan van » luan van, quan luan, quan doan
quan vat » quan sat, quan viet, quang van
vat bien » vat lieu, cam bien
quan va » quan vi, quan ha, luan va

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh dung ((quan van) or (quan va)) hieu luat ) or ( trinh thong quan vat bien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung ((quan van) OR (quan va)) hieu luat ) OR ( trinh thong quan vat bien soan )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung ((quan van) or (quan va)) hieu luat ) or ( trinh thong quan vat bien soan ))*.