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