Perhaps you should try some spelling variations:
trai nghiep » trai nghiem, giai nghiep, tac nghiep
mai nghiep » lam nghiep, xi nghiep, cac nghiep
khach trac » khach trai, khanh trach, khac trai
nghiem dau » nghiep dau, nghiem va, nghiem ban
chan hoc » chat hoc, nhan hoc, than hoc
te khach » he khach, tri khach, tan khach
te sach » toc sach
dau hoc » dai hoc, du hoc, dan hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach ((trai nghiep) OR (mai nghiep)) chan hoc ) or ( te khach trac nghiem dau hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach ((trai nghiep) OR (mai nghiep)) chan hoc ) OR ( te khach trac nghiem dau hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach ((trai nghiep) OR (mai nghiep)) chan hoc ) or ( te khach trac nghiem dau hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( te sach ((trai nghiep) OR (mai nghiep)) chan hoc ) or ( te khach trac nghiem dau hoc ))*.