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
va chat » van chat, va phat, cao chat
danh di » danh du, xanh di, danh dien
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, thuc vat
di cua » dai cua, doi cua, de 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. lieu va chat ((((tuc va) or (duc va))) or (tuc xa)) danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. lieu va chat ((((tuc va) OR (duc va))) OR (tuc xa)) danh di cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. lieu va chat ((((tuc va) or (duc va))) or (tuc xa)) danh di cua tre*.