Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
thuoc va » thuc va, thuoc ma, thuong va
sach ty » sach y, sach tu, sach thu
hieu va » hieu qua
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
va dau » va dao
dau va » dau ve, lau va
va cua » va chua, via cua, ca cua

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 ty ((lang xa) or (dang xay)) hoi. ((hieu va) or (lieu va)) nam thuoc va dau va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty ((lang xa) OR (dang xay)) hoi. ((hieu va) OR (lieu va)) nam thuoc va dau va cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty ((lang xa) or (dang xay)) hoi. ((hieu va) or (lieu va)) nam thuoc va dau va cua tre*.