Perhaps you should try some spelling variations:
kieu cuoi » dieu tuoi, viec cuoi
nhung don » nhung van, nhung bo
khoa hoc » hoa hoc
kieu cao » lieu cao, sieu cao, chieu cao
tu sach » thu sach, su sach, tu cach
te sach » toc sach
don so » dong so, hon so, con so
so vi » so voi, so va, so di

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) or (te sach)) khoa hoc ((kieu cuoi) OR (kieu cao)) cua ets : nhung don so vi đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) khoa hoc ((kieu cuoi) OR (kieu cao)) cua ets : nhung don so vi đai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) khoa hoc ((kieu cuoi) OR (kieu cao)) cua ets : nhung don so vi đai".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) khoa hoc ((kieu cuoi) OR (kieu cao)) cua ets : nhung don so vi đai*.