Perhaps you should try some spelling variations:
quang tuan » quang thanh, quan luan, quang cua
hieu suat » hieu luat, hieu qua
kien soat » kiem soat, bien soan, kien hoa
tuan van » luan van, tran van, quan van
van kien » van tien, van hien, van chien
lan van » luan van, lang van, san van
tan van » tran van, tang van, luan van

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 ((lan van) or (tan van)) hieu suat ) or ( tinh quang tuan van kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung ((lan van) OR (tan van)) hieu suat ) OR ( tinh quang tuan van kien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung ((lan van) or (tan van)) hieu suat ) or ( tinh quang tuan van kien soat ))*.