Perhaps you should try some spelling variations:
tai khoa » da khoa, noi khoa
hanh dai » hanh tai, hanh dao, vanh dai
so sach » so sanh, bo sach, co sach
tai hoa » thai hoa, thi hoa, dai 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 » ky nang, ly nang, v nang
ve cau » ke cau, va cau, ve cac

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 y nang ((tai hoa) OR (tai khoa)). 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 ((tai hoa) OR (tai khoa)). hieu ve cau ((luc van) OR (duc van)) hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach y nang ((tai hoa) OR (tai khoa)). hieu ve cau ((luc van) OR (duc van)) hanh dai cua tre*.