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