Perhaps you should try some spelling variations:
thang quan » thong quan, tang quan, hang quan
minh thang » minh hang, minh trang, dinh thang
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, kiem soat
hieu luat » hieu qua
dung lan » dung luan, dung land, dung lam
quan doi » quan tri, quan li
doi bien » doi dien, voi bien, doi hien
lan van » luan van, lang van, tan van
bien so » bien doi

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

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