Perhaps you should try some spelling variations:
dung luat » dung luan, dung quat, dung cua
hieu soat » hieu suat, hieu hoat, hieu luat
quang cua » quan cua, quang tuan, quang huy
hien soat » thien hoat, kiem soat, hien luat
bien soan » bien so
luat van » luan van, luat dan, luat va
van hieu » cao hieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luat van hieu soat ) OR ( tinh quang cua vat ((hien soat) OR (bien soan)) ))~.
• Adding a wildcard symbol may retrieve word variants: (( tin dung luat van hieu soat ) or ( tinh quang cua vat ((hien soat) or (bien soan)) ))*.