Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » am thuc, nam thu, nam tu
vai cuu » vai cua
dan vai » dan va, dan tai, dan vat
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
van hoe » van hoa, van hoc, van hieu
van hoi » van hoa, van hoc, van loi
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau

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 y nang ((van hoi) OR (van hoe)). hieu va ((nam thuc) OR (nam thuoc)) va dan vai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ((van hoi) OR (van hoe)). hieu va ((nam thuc) or (nam thuoc)) va dan vai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((van hoi) OR (van hoe)). hieu va ((nam thuc) or (nam thuoc)) va dan vai cuu tre*.