Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nhung don » nhung bo
nhung van » phung van, nhung bai, nhung cau
sach khoa » bach khoa, sach nha, anh khoa
khoa hoc » hoa hoc
dieu cao » dieu cam, dieu cac, dieu co
dieu can » dieu hanh, tiep can, dieu cua
so vat » so van

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach khoa hoc ((dieu cao) or (dieu can)) cua ets : ((nhung don) OR (nhung van)) so vat đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach khoa hoc ((dieu cao) OR (dieu can)) cua ets : ((nhung don) OR (nhung van)) so vat đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach khoa hoc ((dieu cao) or (dieu can)) cua ets : ((nhung don) OR (nhung van)) so vat đai".
• Adding a wildcard symbol may retrieve word variants: thuat sach khoa hoc ((dieu cao) or (dieu can)) cua ets : ((nhung don) OR (nhung van)) so vat đai*.