Perhaps you should try some spelling variations:
tien soat » trien hoat, thien hoat, kiem soat
dung quan » dung quang, dung luan, luong quan
lieu soat » kiem soat, hieu suat, lieu so
quan tai » quan tri, quang tri, quan li
tai lieu » vat lieu
ban van » ban dan, ban va, san van
tan van » tran van, tang van, luan van
tinh » trinh, dinh, minh

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

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