Perhaps you should try some spelling variations:
tinh huong » dinh huong, anh huong
huong luan » huong lan, cuong luan, huong loan
quang luan » quan luan, quang tuan, quang uan
kien soat » kiem soat, bien soan, kien hoa
hieu suat » hieu luat
van kien » van tien, van hien, van chien
quang » quanng
qua » quan

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

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