Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
duong luan » dung luan, dong luan, duong quan
quan quan » quan quang, qua quan, quan luan
kien soat » kiem soat, kien hoa, dien hoat
bien soan » bien so
hieu soat » hieu suat, hieu hoat, hieu luat
van hieu » cao hieu
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: (( trinh quan quan va ((kien soat) OR (bien soan)) ) or ( dinh duong luan van hieu soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh quan quan va ((kien soat) OR (bien soan)) ) OR ( dinh duong luan van hieu soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( trinh quan quan va ((kien soat) OR (bien soan)) ) or ( dinh duong luan van hieu soat ))".
• Adding a wildcard symbol may retrieve word variants: (( trinh quan quan va ((kien soat) OR (bien soan)) ) or ( dinh duong luan van hieu soat ))*.