Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac lao » cac loai, cac giao, cac lang
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ca lao » cua lao, ca dao, ca cao
vi cua » vai cua, di cua

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 ve ((cac lao) or (ca lao)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu ve ((cac lao) OR (ca lao)) va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu ve ((cac lao) or (ca lao)) va hanh vi cua tre*.