Perhaps you should try some spelling variations:
nghiep sua » nghiep vua, nghiep cua, nghiep luan
thu doanh » thu oanh, tri doanh, thu hoach
va nghiep » va nghien, lam nghiep, cac nghiep
sach dao » lanh dao
dao nghe » day nghe, da nghe, dat nghe
doanh va » doan va, doanh tai, doanh cua
tu sach » thu sach, su sach, te sach
sua hoc » cua hoc, su hoc, sua khoa
d hoc » du hoc, ad hoc, de hoc

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

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