Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat
dung quang » dang quang, dung quan, luong quang
quang cao » nang cao, quang nam
hieu luat » hieu qua
kien soat » kiem soat, bien soan, kien hoa
van kien » van tien, van hien, van chien
tin » tinh
luan » lan

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