Perhaps you should try some spelling variations:
tinh luong » tinh huong, dinh luong, minh luong
dung thang » hung thang, cung thang, dung thuong
luong quan » thong quan, duong qua
thang van » tang van, thanh van, thong van
hieu soat » hieu suat, hieu hoat, hieu luat
hien soat » thien hoat, kiem soat, bien soan
van hieu » cao hieu
quan van » luan van, quan va, quan luan
van hien » van tien

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

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