Perhaps you should try some spelling variations:
thieu khi » thieu nhi, tien khi, khien khi
toc sach » hoc sach, doc sach, thuoc sach
khoa toc » khoa hoc, khoa thuoc, khoa quoc
hieu chi » hieu cac, hieu moi
nhung bi » nhung bai, nhung gi
hoa toc » hoa hoc, ho toc, hoa doc
bi ho » bi cho, bi hoa, bin ho
ho vi » hoc vi, hoa vi, ho voi

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

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