Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc
thieu chi » thieu nhi, hieu chi, tieu chi
nhung don » nhung van
nhung bo » nhung bi, nhung bai, trung bo
tu sach » thu sach, su sach, te sach
nha hoc » khoa hoc, nha nuoc, thai hoc
chi cua » chi cuc, khi cua, cuoi cua
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: tu sach ((nha hoc) OR (nha thuoc)) thieu chi cua ets : ((nhung don) or (nhung bo)) doc vi đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((nha hoc) OR (nha thuoc)) thieu chi cua ets : ((nhung don) OR (nhung bo)) doc vi đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((nha hoc) OR (nha thuoc)) thieu chi cua ets : ((nhung don) or (nhung bo)) doc vi đai".
• Adding a wildcard symbol may retrieve word variants: tu sach ((nha hoc) OR (nha thuoc)) thieu chi cua ets : ((nhung don) or (nhung bo)) doc vi đai*.