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

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 ((hieu soat) or (hieu luat)) ) or ( tinh quang tran van kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh huong luan van ((hieu soat) OR (hieu luat)) ) OR ( tinh quang tran van kien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh huong luan van ((hieu soat) or (hieu luat)) ) or ( tinh quang tran van kien soat ))*.