Perhaps you should try some spelling variations:
quan quan » quan quang, qua quan, quan luan
kien soat » kiem soat, bien soan, kien hoa
tin quan » tinh quang, trinh quan, lien quan
quan van » quan va, quan luan, quan doan
van kien » van tien, van hien, van chien
hieu ve » hieu van
hieu va » lieu va, hieu qua
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: (( tin quan quan van kien soat ) or ( trinh dung luan van ((hieu ve) or (hieu va)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin quan quan van kien soat ) OR ( trinh dung luan van ((hieu ve) OR (hieu va)) )).
• Adding a wildcard symbol may retrieve word variants: (( tin quan quan van kien soat ) or ( trinh dung luan van ((hieu ve) or (hieu va)) ))*.