Perhaps you should try some spelling variations:
hieu nghi » thieu nhi, huu nghi, hieu chi
nghi cua » nghia cua, nghe cua, ngai cua
trung bo » truong bo, trung hoc, trung hoa
tu sach » thu sach, su sach, te sach
hoa toc » hoa hoc, ho toc, hoa duoc
hoa doc » hoa duoc, hoa hoc, hoa doi
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 ((hoa toc) OR (hoa doc)) hieu nghi cua ets : ((trung bo) or (nhung bai)) oc vi đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((hoa toc) OR (hoa doc)) hieu nghi cua ets : ((trung bo) OR (nhung bai)) oc vi đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((hoa toc) OR (hoa doc)) hieu nghi cua ets : ((trung bo) or (nhung bai)) oc vi đai".
• Adding a wildcard symbol may retrieve word variants: tu sach ((hoa toc) OR (hoa doc)) hieu nghi cua ets : ((trung bo) or (nhung bai)) oc vi đai*.