Perhaps you should try some spelling variations:
khong quan » thong quan, hong quan, thong quang
tinh khong » tinh khang, tinh huong, benh khong
chien soat » thien hoat
hieu luat » hieu qua
van chien » van hien, van tien
van hieu » cao hieu
quan van » quan va, quan luan, quan doan
luan » lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((tinh quang) or (tin dung)) luan van hieu luat ) or ( tinh khong quan van chien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tinh quang) OR (tin dung)) luan van hieu luat ) OR ( tinh khong quan van chien soat )).
• Adding a wildcard symbol may retrieve word variants: (( ((tinh quang) or (tin dung)) luan van hieu luat ) or ( tinh khong quan van chien soat ))*.