Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
dang xay » dang van, van xay
su sach » so sach, vu sach
vat dao » va dao, van dao, vat da
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
dao va » dao van, tao va, do va
va cua » va chua, via cua, ca cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((lang xa) OR (dang xay)) hoi. hieu qua ((nam thuc) OR (nam thuoc)) vat dao va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((lang xa) or (dang xay)) hoi. hieu qua ((nam thuc) OR (nam thuoc)) vat dao va cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((lang xa) or (dang xay)) hoi. hieu qua ((nam thuc) OR (nam thuoc)) vat dao va cua tre*.