Perhaps you should try some spelling variations:
trinh luong » trinh duong, trinh huong, trinh xuong
dung quang » dang quang, dung quan, luong quang
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
tien soat » trien hoat, thien hoat, kiem soat
quang va » quang van, quan va, quang ma
quan van » luan van, quan va, quan doan
va hieu » van hieu, va dieu, va hien

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 quang va hieu soat ) or ( trinh luong ((quan van) or (quan luan)) tien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung quang va hieu soat ) OR ( trinh luong ((quan van) OR (quan luan)) tien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung quang va hieu soat ) or ( trinh luong ((quan van) or (quan luan)) tien soat ))*.