Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
hoc sach » hoc sinh, hoc cac, hoc anh
nam 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
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ca dan » cac dan, ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky lang xa hoi. hieu va ((((nam thuc) OR (nam thuoc))) or (am thuc)) ca dan vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky lang xa hoi. hieu va ((((nam thuc) OR (nam thuoc))) OR (am thuc)) ca dan vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky lang xa hoi. hieu va ((((nam thuc) OR (nam thuoc))) or (am thuc)) ca dan vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky lang xa hoi. hieu va ((((nam thuc) OR (nam thuoc))) or (am thuc)) ca dan vai cuu tre*.