Perhaps you should try some spelling variations:
hieu nghi » thieu nhi, huu nghi, hieu chi
toc hieu » toc thieu, doc hieu, hoc thieu
nghi cua » nghia cua, nghe cua, ngai cua
trung bo » truong bo, trung hoc, trung hoa
su sach » so sach
vu sach » vu bach, vu khach
hoa toc » hoa hoc, ho toc, hoa doc
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: ((su sach) OR (vu sach)) hoa toc 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: ((su sach) OR (vu sach)) hoa toc 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: "((su sach) OR (vu sach)) hoa toc hieu nghi cua ets : ((trung bo) or (nhung bai)) oc vi đai".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) hoa toc hieu nghi cua ets : ((trung bo) or (nhung bai)) oc vi đai*.