Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh do » thanh pho, thanh hoa, thanh loi
thanh de » hanh de, thanh ve, thanh le
nang xa » nang x, lang xa, nang ma
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. hieu qua ((cau luc) or (cam xuc)) va ((thanh do) or (thanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. hieu qua ((cau luc) OR (cam xuc)) va ((thanh do) OR (thanh de)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. hieu qua ((cau luc) or (cam xuc)) va ((thanh do) or (thanh de)) cua tre*.