Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hieu va » lieu va, hieu qua
vai cuu » vai cua
dao vai » dao van, dao va, dao bai
thuc va » thuc vat, thuc dan, thuc day
toc sac » toc sach, toc san, hoc sach
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
ky lang » ky nang, tay lang
cuu tre » cua tre, cau tren, cau treo
va nam » van nam, ha nam, va nay
va dao » ca dao

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 sac ((((ky lang) OR (ky tang))) OR (ky dang)) xa hoi. hieu va nam thuc va dao vai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ((((ky lang) OR (ky tang))) or (ky dang)) xa hoi. hieu va nam thuc va dao vai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: toc sac ((((ky lang) OR (ky tang))) or (ky dang)) xa hoi. hieu va nam thuc va dao vai cuu tre*.