Perhaps you should try some spelling variations:
quang tran » quang tuan, quang trung, quang thanh
tinh huong » dinh huong, anh huong
huong tan » huong tran, huong dan, huong lan
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
tran van » luan van
van kiem » va kiem, van kien, van hieu
tan van » tang van, luan van, dang 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: (( tinh huong tan van ((hieu so) or (hieu suat)) ) or ( tinh quang tran van kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh huong tan van ((hieu so) OR (hieu suat)) ) OR ( tinh quang tran van kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh huong tan van ((hieu so) or (hieu suat)) ) or ( tinh quang tran van kiem soat ))*.