Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
nhung bo » nhung bi, nhung bai, nhung don
hoc viet » hoc hien
su sach » vu sach
so sach » so sanh, bo sach, co sach
nhi cua » nghi cua, chi cua, khi cua
ha hoc » hoa hoc, nha hoc, va hoc
bo hoc » bao hoc, bot hoc, co 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 sach) OR (so sach)) ((ha hoc) or (nha thuoc)) thieu nhi cua ets : nhung bo hoc viet đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ((ha hoc) OR (nha thuoc)) thieu nhi cua ets : nhung bo hoc viet đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ((ha hoc) or (nha thuoc)) thieu nhi cua ets : nhung bo hoc viet đai".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ((ha hoc) or (nha thuoc)) thieu nhi cua ets : nhung bo hoc viet đai*.