Perhaps you should try some spelling variations:
hanh hoi » hanh thoi, hanh noi, hanh hoa
thuc ban » thuoc ban, thuc dan, thu ban
so sach » so sanh, bo sach, co sach
tuc ban » truc ban, tu ban, tuc dan
hoi cua » hoi chuc
ty nang » ky nang, ty hang, ly nang
cua tre » cua te, cuu tre, cua triet
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) OR (thuc ban)) hanh hoi cua 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) OR (thuc ban)) hanh hoi cua 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) OR (thuc ban)) hanh hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) or (ty xang)) xa hoi. lieu va dau ((tuc ban) OR (thuc ban)) hanh hoi cua tre*.