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
su sach » so sach, vu sach
hoa toc » hoa hoc, ho toc, hoa doc
so toc » so hoc, co toc, ho toc
doc vi » hoc vi, don vi, doc va

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 ((hoa toc) or (so toc)) hieu nghi cua ets : ((trung bo) or (nhung bai)) doc vi đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((hoa toc) OR (so toc)) hieu nghi cua ets : ((trung bo) OR (nhung bai)) doc vi đai.
• Adding a wildcard symbol may retrieve word variants: su sach ((hoa toc) or (so toc)) hieu nghi cua ets : ((trung bo) or (nhung bai)) doc vi đai*.