Perhaps you should try some spelling variations:
xay nghiem » xet nghiem, day nghiep, van nghiem
thu sach » tu sach, thuat sach, thuoc sach
sach dao » lanh dao
dao nghe » day nghe, da nghe, dat nghe
nghe adn » nghe dan, nghe san, nghe son
adn hoc » ad hoc
su hoc » tu hoc, du hoc, su ho
so hoc » co hoc, mo hoc, o hoc
so hoa » do hoa, so ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu sach dao nghe adn hoc ) or ( thu hoach xay nghiem ((su hoc) or (((so hoc) OR (so hoa)))) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach dao nghe adn hoc ) OR ( thu hoach xay nghiem ((su hoc) OR (((so hoc) OR (so hoa)))) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thu sach dao nghe adn hoc ) or ( thu hoach xay nghiem ((su hoc) or (((so hoc) OR (so hoa)))) ))".
• Adding a wildcard symbol may retrieve word variants: (( thu sach dao nghe adn hoc ) or ( thu hoach xay nghiem ((su hoc) or (((so hoc) OR (so hoa)))) ))*.