Perhaps you should try some spelling variations:
trai nghiep » trai nghiem, trac nghiem, mai nghiep
nghiep cau » nghiep cay, nghiep can, nghiep chan
thanh nghi » thanh nguoi, thanh ngu, hanh nghe
sanh trai » anh trac, hanh tai, sinh trac
nghi duoc » nghia duoc, nghi cuoc, nghe duoc
duoc hoc » quoc hoi
so sanh » do sanh
so dang » su dang, so dung, xo dang
so dan » co dan, so dac

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sanh trai nghiep cau hoi ) or ( ((so dang) OR (so dan)) thanh nghi duoc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh trai nghiep cau hoi ) OR ( ((so dang) OR (so dan)) thanh nghi duoc hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so sanh trai nghiep cau hoi ) or ( ((so dang) OR (so dan)) thanh nghi duoc hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( so sanh trai nghiep cau hoi ) or ( ((so dang) OR (so dan)) thanh nghi duoc hoc ))*.