Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
duc ban » duc tan, duc van, dua ban
tai cua » thai cua, tai cuc, tri cua
cuc ban » cua ban, cac ban, cuu ban
xuc ban » quoc ban, xuat ban, buoc ban
hieu va » lieu va, hieu qua
nang co » nang cao, nang doc, nang noi
y nang » ky nang, ly nang, v nang
va cao » va cac, va co, va dao
co hoi » co hoc, co loi
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 co hoi. hieu va cao ((((xuc ban) OR (duc 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 co hoi. hieu va cao ((((xuc ban) OR (duc ban))) OR (cuc ban)) hanh tai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang co hoi. hieu va cao ((((xuc ban) OR (duc ban))) or (cuc ban)) hanh tai cua tu".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang co hoi. hieu va cao ((((xuc ban) OR (duc ban))) or (cuc ban)) hanh tai cua tu*.