Perhaps you should try some spelling variations:
quang quan » quang tuan, quang uan, quan quan
hieu suat » hieu luat, hieu qua
kien soat » bien soan, kien hoa, dien hoat
kiem soat » kiem toan
dung lan » dung luan, dung land, dung lam
van hieu » cao hieu
quan van » luan van, quan va, quan luan
lan van » luan van, lang van, tan van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung lan van hieu suat ) OR ( tinh quang quan van ((kien soat) OR (kiem soat)) ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( trinh dung lan van hieu suat ) or ( tinh quang quan van ((kien soat) OR (kiem soat)) ))~".
• Adding a wildcard symbol may retrieve word variants: (( trinh dung lan van hieu suat ) or ( tinh quang quan van ((kien soat) OR (kiem soat)) ))*.