Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
ban hanh » ban hang
so sach » so sanh, co sach, hoc sach
cua tre » cua te, cua triet, dua tren
tuc ban » thuc ban, truc ban, tu ban
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
cuu tre » cau tren, cau treo
bo sach » co sach, hoc sach
nang o » nang co, nang ho, nang ro
y nang » ky nang, ly nang, v nang
o hoi » co hoi, o hoc, o hai

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) or (bo sach)) y nang o hoi. hieu va cac tuc ban hanh dai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) y nang o hoi. hieu va cac tuc ban hanh dai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (bo sach)) y nang o hoi. hieu va cac tuc ban hanh dai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) y nang o hoi. hieu va cac tuc ban hanh dai ((cua tre) OR (cuu tre))*.