Perhaps you should try some spelling variations:
nghe thuoc » nghe thuc, nghiem thuoc, nghe thuat
thuoc hoc » thuoc ho, thuoc nhom, thuong hoc
nghe thu » nghe thuat
tu sach » thu sach, te sach, tu cach
nghe tu » nghe xu, nghi tu, nghe te
cac van » cac dan
su sach » so sach, vu sach
su cac » tu cac, su cao, su can

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 van nghe thuoc hoc ) or ( ((tu sach) or (su sach)) khoe ((nghe tu) OR (nghe thu)) hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su cac van nghe thuoc hoc ) OR ( ((tu sach) OR (su sach)) khoe ((nghe tu) OR (nghe thu)) hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su cac van nghe thuoc hoc ) or ( ((tu sach) or (su sach)) khoe ((nghe tu) OR (nghe thu)) hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( su cac van nghe thuoc hoc ) or ( ((tu sach) or (su sach)) khoe ((nghe tu) OR (nghe thu)) hoc ))*.