Perhaps you should try some spelling variations:
tinh luong » tinh huong, dinh luong, minh luong
quang luan » quan luan, quang tuan, quang uan
luong quan » thong quan, duong qua
hieu soat » hieu hoat, hieu luat, kiem soat
hieu suat » hieu luat, hieu qua
kien soat » kiem soat, bien soan, kien hoa
quan van » quan va, quan luan, quan doan
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 quang luan van ((hieu soat) or (hieu suat)) ) or ( tinh luong quan van kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang luan van ((hieu soat) OR (hieu suat)) ) OR ( tinh luong quan van kien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh quang luan van ((hieu soat) or (hieu suat)) ) or ( tinh luong quan van kien soat ))*.