Perhaps you should try some spelling variations:
thieu moi » thien moi, thieu mot, thieu so
khoa toc » khoa hoc, khoa thuoc, khoa quoc
hieu moi » nhiem moi, hieu so, hieu bo
nhung bo » nhung bi, nhung bai, nhung don
tu sach » thu sach, su sach, te sach
hoa toc » hoa hoc, ho toc, hoa doc
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: tu sach ((khoa toc) OR (hoa toc)) ((thieu moi) or (hieu moi)) cua ets : nhung bo oc vi đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((khoa toc) OR (hoa toc)) ((thieu moi) OR (hieu moi)) cua ets : nhung bo oc vi đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((khoa toc) OR (hoa toc)) ((thieu moi) or (hieu moi)) cua ets : nhung bo oc vi đai".
• Adding a wildcard symbol may retrieve word variants: tu sach ((khoa toc) OR (hoa toc)) ((thieu moi) or (hieu moi)) cua ets : nhung bo oc vi đai*.