Perhaps you should try some spelling variations:
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
qua cam » qua cham, qua ca, qua cai
qua cac » cua cac
cua tre » cua te, cuu tre, cua triet

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 ((qua cam) or (qua cac)) duc va ((hanh vai) 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 ((qua cam) OR (qua cac)) duc va ((hanh vai) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. hieu ((qua cam) or (qua cac)) duc va ((hanh vai) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang xa hoi. hieu ((qua cam) or (qua cac)) duc va ((hanh vai) OR (hanh vi)) cua tre*.