Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
chat xuc » cam xuc, chao xu, chat cua
doc sach » hoc sach, nuoc sach, dac sac
van hanh » van thanh, ban hanh, van anh
chat huu » pham huu
hanh di » hanh vi, hanh de, hang di
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
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) or (doc sach)) ty nang xa hoi. hieu ve ((chat xuc) or (chat huu)) van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ty nang xa hoi. hieu ve ((chat xuc) OR (chat huu)) van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (doc sach)) ty nang xa hoi. hieu ve ((chat xuc) or (chat huu)) van hanh di cua tre*.