Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien cac » thien cac, vien cac, hieu cac
hanh vai » hanh va, hanh tai, hanh voi
hanh van » thanh van, khanh van, hanh va
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
cac vo » cac co, cac vi, cac bo
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu hien cac vo van ((((hanh vai) or (hanh van))) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang x hoi. hieu hien cac vo van ((((hanh vai) OR (hanh van))) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang x hoi. hieu hien cac vo van ((((hanh vai) or (hanh van))) or (hanh vi)) cua tre*.