Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
toc sach » hoc sach, doc sach, thuoc sach
lang xa » lang ha, dang xay, lang van
hieu ha » hieu hoa, hieu va, hieu ca
sach ky » sac ky, sach y, sach ty
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
va dan » ca dan, va dau, va dap
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 sach ky ((lang xa) or (nang x)) hoi. hieu ha nam thuoc ((va dan) OR (va dao)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((lang xa) OR (nang x)) hoi. hieu ha nam thuoc ((va dan) OR (va dao)) vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((lang xa) or (nang x)) hoi. hieu ha nam thuoc ((va dan) OR (va dao)) vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang xa) or (nang x)) hoi. hieu ha nam thuoc ((va dan) OR (va dao)) vai cuu tre*.