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 luat » hieu qua
hieu suat » hieu qua
quan li » quan ly, quan tri
li bien » li dien, li hien, loai bien
bien so » bien doi
luan » lan

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 luan van ((hieu luat) or (hieu suat)) ) or ( minh thang quan li bien so ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van ((hieu luat) OR (hieu suat)) ) OR ( minh thang quan li bien so )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van ((hieu luat) or (hieu suat)) ) or ( minh thang quan li bien so ))*.