Perhaps you should try some spelling variations:
va nghiep » va nghien, lam nghiep, cac nghiep
khien hoc » nhiet hoc
nghiep du » nghiep dau, nghiep vu, nghiep tu
sach dat » sach dao, sach danh, sach bai
dat nghe » day nghe, da nghe, dang nghe
dien hoc » dien hoa, tin hoc, lieu hoc
hoach va » hoach xay, hanh va, doanh va
su sach » so sach, vu sach
du hoc » tu hoc, duoc hoc
d hoc » ad hoc, de hoc, y hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach dat nghe ((d hoc) or (((dien hoc) or (khien hoc)))) ) or ( thu hoach va nghiep du hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach dat nghe ((d hoc) OR (((dien hoc) OR (khien hoc)))) ) OR ( thu hoach va nghiep du hoc )).
• Adding a wildcard symbol may retrieve word variants: (( su sach dat nghe ((d hoc) or (((dien hoc) or (khien hoc)))) ) or ( thu hoach va nghiep du hoc ))*.