Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
xuc ban » duc ban, quoc ban, xuat ban
cuc ban » cua ban, cac ban, cuu ban
tai cua » thai cua, tai cuc, tri cua
y nang » ky nang, ly nang, v nang
va cao » va cac, va co, va dao
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang cao hoi. hieu va cao ((xuc ban) or (cuc ban)) hanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang cao hoi. hieu va cao ((xuc ban) OR (cuc ban)) hanh tai cua tu.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang cao hoi. hieu va cao ((xuc ban) or (cuc ban)) hanh tai cua tu*.