Perhaps you should try some spelling variations:
huong luan » huong lan, cuong luan, huong loan
quang uan » quang tuan, quang ban, quang tran
hieu soat » hieu suat, hieu hoat, hieu luat
kien soat » kiem soat, bien soan, kien hoa
van kien » van tien, van hien, van chien
uan van » quan van, tan van, san van
tinh » trinh, dinh, minh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh quang uan van ((hieu soat) or (hieu qua)) ) or ( anh huong luan van kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang uan van ((hieu soat) OR (hieu qua)) ) OR ( anh huong luan van kien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh quang uan van ((hieu soat) or (hieu qua)) ) or ( anh huong luan van kien soat ))*.