Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
chat cua » nhat cua, chat va, ca cua
chat huu » pham huu
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
cuu tre » cua tre, cau tren, cau treo
cua te » cua tu

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 nang xa hoi. hieu van ((chat cua) or (chat huu)) va danh di ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu van ((chat cua) OR (chat huu)) va danh di ((cua te) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu van ((chat cua) or (chat huu)) va danh di ((cua te) or (cuu tre))*.