Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nam thuoc » nam thuc, nam thu, nha thuoc
doc sach » hoc sach, toc sach, nuoc sach
hieu cua » hieu qua, dieu cua, bieu cua
vai cuu » vai cua
cua nam » cua tam, cua ngan, cua nhan
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo
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: ((doc sach) or (thuoc sach)) ky lang xa hoi. hieu cua nam thuoc ((va dan) or (ca dan)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (thuoc sach)) ky lang xa hoi. hieu cua nam thuoc ((va dan) OR (ca dan)) vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (thuoc sach)) ky lang xa hoi. hieu cua nam thuoc ((va dan) or (ca dan)) vai cuu tre*.