Perhaps you should try some spelling variations:
quang quan » quang tuan, quang uan, quan quan
dinh huong » dinh duong, anh huong
huong lan » phuong lan, thuong lan, huong dan
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
quan van » luan van, quan va, quan luan
van kiem » va kiem, van kien, van hieu
lan van » luan van, lang van, tan van
hieu so » thieu so

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

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