Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
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: toc sach ky nang xa hoi. hieu va ((nam thuc) OR (nam thuoc)) ((va dan) OR (ca dan)) va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. hieu va ((nam thuc) or (nam thuoc)) ((va dan) OR (ca dan)) va cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu va ((nam thuc) or (nam thuoc)) ((va dan) OR (ca dan)) va cua tre*.