Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
toc sac » toc sach, toc san, hoc sach
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky
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.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky tang xa hoi. hieu va nam thuc ((va dao) or (va dau)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky tang xa hoi. hieu va nam thuc ((va dao) OR (va dau)) vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sac ky tang xa hoi. hieu va nam thuc ((va dao) or (va dau)) vai cuu tre*.