Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
tinh dang » binh dang, tinh sang, dinh dang
dang quan » dang quang, nang quan, dung quan
kien soat » kiem soat, kien hoa, dien hoat
bien soan » bien so
van hieu » cao hieu

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 luan van hieu soat ) or ( tinh dang quan luan ((kien soat) OR (bien soan)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu soat ) OR ( tinh dang quan luan ((kien soat) OR (bien soan)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung luan van hieu soat ) or ( tinh dang quan luan ((kien soat) OR (bien soan)) ))".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu soat ) or ( tinh dang quan luan ((kien soat) OR (bien soan)) ))*.