Perhaps you should try some spelling variations:
trinh thong » trinh thuong, trinh trong, trinh tong
dung quang » dang quang, dung quan, luong quang
tinh dung » trinh dung, tin dung, tinh quang
quang van » quang ban, quang uan, quang va
hieu soat » hieu suat, hieu hoat, hieu luat
kien soat » bien soan, kien hoa, dien hoat
kiem soat » kiem toan
van hieu » cao hieu
quan van » luan van, quan va, quan luan

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