Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, kiem soat
hieu luat » hieu qua
nang xuat » nang suat, hang xuat, nang xuan
xuat khoa » xuat khau, vat khoa, luan khoa
khoa bien » hoa bien, khoa tieng, khoa dieu
ki nang » ky nang
bien so » bien doi
luan » quan, 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 soat) or (hieu luat)) ) or ( ki nang xuat khoa bien so ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van ((hieu soat) OR (hieu luat)) ) OR ( ki nang xuat khoa bien so )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van ((hieu soat) or (hieu luat)) ) or ( ki nang xuat khoa bien so ))*.