Perhaps you should try some spelling variations:
trai nghiep » trai nghiem, trac nghiem, mai nghiep
phap khau » nhap khau, phap khac, phap khang
khau trai » khau tai, khac trai, kham trai
nha kham » nhan kham, nhap khau, khoa kham
nho kham » khoa kham, nhan kham, kho khan
va hoc » van hoc
vu hoc » tu hoc, du hoc, vi hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( phap khau trai nghiep va hoc ) or ( ((nha kham) OR (nho kham)) trai nghiep vu hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( phap khau trai nghiep va hoc ) OR ( ((nha kham) OR (nho kham)) trai nghiep vu hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( phap khau trai nghiep va hoc ) or ( ((nha kham) OR (nho kham)) trai nghiep vu hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( phap khau trai nghiep va hoc ) or ( ((nha kham) OR (nho kham)) trai nghiep vu hoc ))*.