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