Perhaps you should try some spelling variations:
nghiem dau » nghiep dau, nghiem va, nghiem ban
nghiem de » nghiem d, nghiem do, nghiem te
sach dao » lanh dao
dao nghe » day nghe, da nghe, dat nghe
hoach va » hoach xay, hanh va, doanh va
tu sach » thu sach, su sach, te sach
nghe d » nghe di, nghe _, nghe 新
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 ( thu hoach va ((nghiem dau) or (nghiem de)) hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach dao nghe d hoc ) OR ( thu hoach va ((nghiem dau) OR (nghiem de)) hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach dao nghe d hoc ) or ( thu hoach va ((nghiem dau) or (nghiem de)) hoc ))*.