Perhaps you should try some spelling variations:
nghe thuoc » nghe thuc, nghiem thuoc, nghe thuat
thuoc hoc » thuoc ho, thuoc nhom, thuong hoc
khoe nghe » kho nghe
bai nghe » thai nghe, van nghe, nam nghe
cao bai » cao tai, cac bai, cap bai
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
nghe tu » nghe thu, nghe xu, nghi tu
su cao » cu cao, vu cao, su co
tu hoc » te 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 cao bai nghe thuoc hoc ) or ( ((tu sach) or (su sach)) khoe nghe tu hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su cao bai nghe thuoc hoc ) OR ( ((tu sach) OR (su sach)) khoe nghe tu hoc )).
• Adding a wildcard symbol may retrieve word variants: (( su cao bai nghe thuoc hoc ) or ( ((tu sach) or (su sach)) khoe nghe tu hoc ))*.