Perhaps you should try some spelling variations:
tinh luong » tinh huong, dinh luong, minh luong
quang tang » quang thang, quang dang, quang tung
hieu soat » hieu suat, hieu hoat, hieu luat
kiem soat » kiem toan
quan van » luan van, quan luan, quan doan
tang van » dang van, hoang van, trong van
van kiem » va kiem, van kien, van hieu
quan va » quan vi, quan ha, luan va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh luong ((quan van) OR (quan va)) hieu soat ) OR ( tinh quang tang van kiem soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh luong ((quan van) OR (quan va)) hieu soat ) or ( tinh quang tang van kiem soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( tinh luong ((quan van) OR (quan va)) hieu soat ) or ( tinh quang tang van kiem soat ))*.