Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cuc ban » cua ban, cac ban, cuu ban
va chat » van chat, va phat, cao chat
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
hanh d » hanh de, anh d, hanh y
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: tu sach ky nang x hoi. hieu ((va cam) or (va chat)) cuc ban ((hanh d) OR (hanh _)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ((va cam) OR (va chat)) cuc ban ((hanh d) OR (hanh _)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu ((va cam) or (va chat)) cuc ban ((hanh d) OR (hanh _)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ((va cam) or (va chat)) cuc ban ((hanh d) OR (hanh _)) cua tre*.