Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
hanh vai » hanh va, hanh tai, hanh van
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
cac vo » cac co, cac vi, cac bo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang xa hoi. hieu va cac vo van ((((hanh vai) or (thanh van))) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang xa hoi. hieu va cac vo van ((((hanh vai) OR (thanh van))) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang xa hoi. hieu va cac vo van ((((hanh vai) or (thanh van))) or (hanh vi)) cua tre*.