Perhaps you should try some spelling variations:
tinh luong » tinh huong, dinh luong, minh luong
dung quang » dang quang, dung quan, luong quang
luong quan » thong quan, duong qua
tinh dung » trinh dung, tin dung, tinh quang
quang van » quang ban, quang uan, quang va
hieu soat » hieu suat, hieu luat, hieu so
hieu hoat » hieu hoa, thien hoat, hieu luat
kiem soat » kiem toan
quan van » luan van, quan va, quan luan
van kiem » va kiem, van kien, van hieu

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