Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
thu sach » tu sach, thuat sach, thuoc sach
hai cua » thai cua, dai cua, hoi cua
van hai » van ha, van chat, van hanh
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
va cap » va cac, va dap, va cai
va cao » va cac, va co, va dao
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: ((thu sach) or (nuoc sach)) ty nang x hoi. hieu ((va cap) OR (va cao)) nuoc va van hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (nuoc sach)) ty nang x hoi. hieu ((va cap) OR (va cao)) nuoc va van hai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (nuoc sach)) ty nang x hoi. hieu ((va cap) OR (va cao)) nuoc va van hai cua tre*".