Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
quang luat » quan luan, quang cua, quang tuan
dung luat » dung luan, dung quat, dung cua
hieu soat » hieu hoat, hieu luat, kiem soat
hieu suat » hieu luat, hieu qua
van thien » van tien, van hien, van chien
luat van » luan van, luat dan, luat va

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin dung luat van ((hieu soat) OR (hieu suat)) ) or ( tinh quang luat van thien thanh ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luat van ((hieu soat) OR (hieu suat)) ) OR ( tinh quang luat van thien thanh )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tin dung luat van ((hieu soat) OR (hieu suat)) ) or ( tinh quang luat van thien thanh ))".
• Adding a wildcard symbol may retrieve word variants: (( tin dung luat van ((hieu soat) OR (hieu suat)) ) or ( tinh quang luat van thien thanh ))*.