Perhaps you should try some spelling variations:
dinh thong » dinh thuong, dinh hong, dinh trong
luan tien » luan tieu, tuan tien, luan lien
tien soat » trien hoat, thien hoat, kiem soat
hieu suat » hieu luat, hieu qua
tinh qua » tinh quan, trinh qua, tinh cua
quan van » luan van, quan va, quan doan
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 qua quan luan tien soat ) or ( dinh thong quan van hieu suat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh qua quan luan tien soat ) OR ( dinh thong quan van hieu suat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh qua quan luan tien soat ) or ( dinh thong quan van hieu suat ))*.