Perhaps you should try some spelling variations:
thieu chi » thieu nhi, hieu chi, tieu chi
nhung bo » nhung bi, nhung bai, nhung don
toc sach » hoc sach, doc sach, thuoc sach
chi cua » chi cuc, khi cua, cuoi cua
hoa doc » hoa duoc, hoa hoc, hoa doi
hoa toc » hoa hoc, ho toc, hoa duoc
bo oc » bo uoc, bo o
oc vi » hoc vi, doc vi

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

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