Perhaps you should try some spelling variations:
nghiem thuoc » nghiem duoc, nghiem hoa, nghi thuc
van nghiem » van nghe, van nghia, quang nghiem
thuoc nhom » thuoc ho
sach khoe » suc khoe, bach khoa, sach che
khoe nghe » kho nghe
tu sach » thu sach, su sach, te sach
su cac » su cao, su can, eu cac

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) or (tu cac)) van nghiem thuoc nhom ) or ( tu sach khoe nghe ((tu hoc) or (te hoc)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((su cac) OR (tu cac)) van nghiem thuoc nhom ) OR ( tu sach khoe nghe ((tu hoc) OR (te hoc)) )).
• Adding a wildcard symbol may retrieve word variants: (( ((su cac) or (tu cac)) van nghiem thuoc nhom ) or ( tu sach khoe nghe ((tu hoc) or (te hoc)) ))*.