Perhaps you should try some spelling variations:
khoa thuoc » khong thuoc, khoa hoc, nha thuoc
thieu khi » thieu nhi, tien khi, hieu chi
khoa toc » khoa hoc, hoa toc, khoa quoc
nhung bi » nhung bai, nhung gi
tu sach » thu sach, su sach, te sach
khi cua » chi cua, thai cua
hoc vi » hoc viet

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

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