Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
so sach » so sanh, bo sach, co sach
tai hoa » tai khoa, thai hoa, thi hoa
hieu ve » hieu va, hieu van
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
ve cau » ke cau, va cau, ve cac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y nang) OR (ky nang)) tai hoa. hieu ve cau ((luc van) OR (duc van)) hanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((y nang) OR (ky nang)) tai hoa. hieu ve cau ((luc van) or (duc van)) hanh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: so sach ((y nang) OR (ky nang)) tai hoa. hieu ve cau ((luc van) or (duc van)) hanh dai cua tre*.