Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va dao » ca dao
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (thuat sach)) ky lang 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 sach) OR (thuat sach)) ky lang xa hoi. hieu va nam thuc ((va dao) OR (va dau)) vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuat sach)) ky lang xa hoi. hieu va nam thuc ((va dao) or (va dau)) vai cuu tre*.