Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh huong
hieu soat » hieu suat, hieu hoat, hieu luat
van hieu » cao hieu
nang sat » nang suat, nang phat, nang sang
hoi bien » hoa bien, hoi vien, voi bien
ki nang » ky nang
sat hoi » sat voi, luat hoi, sach hoi
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) OR (tinh quang)) luan van hieu soat ) or ( ki nang sat hoi bien so ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tinh dung) OR (tinh quang)) luan van hieu soat ) OR ( ki nang sat hoi bien so )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((tinh dung) OR (tinh quang)) luan van hieu soat ) or ( ki nang sat hoi bien so ))".
• Adding a wildcard symbol may retrieve word variants: (( ((tinh dung) OR (tinh quang)) luan van hieu soat ) or ( ki nang sat hoi bien so ))*.