Perhaps you should try some spelling variations:
hanh hoi » hanh thoi, hanh noi, hanh hoa
ban hanh » ban hang
so sach » so sanh, bo sach, co sach
tuc ban » thuc ban, truc ban, tu ban
cua tre » cua te, cua triet, dua tren
dau tuc » dau tu, dao tuc, cau truc
ty nang » ky nang, ty hang, ly nang
cuu tre » cau tren, cau treo
va dau » va dao

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