Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
nay thuc » nam thuc, cay thuc, day thuc
cau treo » cau theo, cau tren, cau triet
hoc sach » hoc sinh, hoc cac, hoc anh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
vai cau » va cau, van cau, vai cac
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
va nay » va ngay, va cay

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 (hoc sach)) ky lang xa hoi. hieu va nay thuc ((va dan) or (ca dan)) vai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky lang xa hoi. hieu va nay thuc ((va dan) OR (ca dan)) vai cau treo.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) ky lang xa hoi. hieu va nay thuc ((va dan) or (ca dan)) vai cau treo*.