Perhaps you should try some spelling variations:
trai nghiep » trai nghiem, trac nghiem, mai nghiep
khanh trai » khanh tra, khach trai, khanh trach
thi nghiem » thuc nghiem
nghiem de » nghiem d, nghiem do, nghiem te
le khanh » le thanh, le anh, de thanh
nghiep y » nghiep ly, nghiep o, nghiep cay
khac thi » khau thi, khuc thi, khuat thi
de khac » se khac, dieu khac, he khach
de hoc » te hoc, du hoc, dien hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( le khanh trai nghiep y hoc ) or ( de khac thi nghiem de hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( le khanh trai nghiep y hoc ) OR ( de khac thi nghiem de hoc )).
• Adding a wildcard symbol may retrieve word variants: (( le khanh trai nghiep y hoc ) or ( de khac thi nghiem de hoc ))*.