Perhaps you should try some spelling variations:
thuoc dan » thuoc dang, thuc dan, thuoc ban
nam thuoc » nam thuc, nam thu, nha thuoc
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
vu san » va san, vu ban
san ky » sang ky, van ky, dan ky
ve nam » he nam, va nam, le nam
dan di » danh di, dan de, dan li
dan da » dan dat, dan ca, dan va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu san ky nang ((x ho) or (xa hoi)). hieu ve nam thuoc dan ((dan di) OR (dan da)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu san ky nang ((x ho) OR (xa hoi)). hieu ve nam thuoc dan ((dan di) OR (dan da)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu san ky nang ((x ho) or (xa hoi)). hieu ve nam thuoc dan ((dan di) OR (dan da)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: vu san ky nang ((x ho) or (xa hoi)). hieu ve nam thuoc dan ((dan di) OR (dan da)) cuu tre*.