Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
khoa thuoc » khong thuoc, khoa hoc, nha thuoc
hieu nghi » thieu nhi, huu nghi, hieu chi
khoa toc » khoa hoc, hoa toc, khoa quoc
nghi cua » nghia cua, nghe cua, ngai cua
nhung bo » nhung bi, nhung bai, nhung don
duoc vi » duoc si, duoc li, doc vi
duoc va » nuoc va, duc va, duoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((khoa toc) or (khoa thuoc)) hieu nghi cua ets : nhung bo ((duoc vi) OR (duoc va)) đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((khoa toc) OR (khoa thuoc)) hieu nghi cua ets : nhung bo ((duoc vi) OR (duoc va)) đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((khoa toc) or (khoa thuoc)) hieu nghi cua ets : nhung bo ((duoc vi) OR (duoc va)) đai".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((khoa toc) or (khoa thuoc)) hieu nghi cua ets : nhung bo ((duoc vi) OR (duoc va)) đai*.