Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nam thuc » nam thuoc, am thuc, nam thu
cau treo » cau theo, cau tren, cau triet
tang ma » mang may, tang van
tang xa » trang xa, lang xa, tang ha
sach ky » sac ky, sach y, sach ty
vai cau » va cau, van cau, vai cac
hieu ha » hieu hoa, hieu va, hieu ca
va dan » va dao, va dau, va dap
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: thuoc sach ky ((tang xa) or (tang ma)) hoi. hieu ha nam thuc ((va dan) OR (ca dan)) vai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((tang xa) OR (tang ma)) hoi. hieu ha nam thuc ((va dan) OR (ca dan)) vai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky ((tang xa) or (tang ma)) hoi. hieu ha nam thuc ((va dan) OR (ca dan)) vai cau treo".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((tang xa) or (tang ma)) hoi. hieu ha nam thuc ((va dan) OR (ca dan)) vai cau treo*.