Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
thu sach » tu sach, thuat sach, thuoc sach
thanh co » thanh do, thanh ca, thanh ho
cua viet » ca viet, hoa viet, cua vat
hac dan » nhac dan, hoc dan, cac dan
dan ban » van ban, can ban, dan ba
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
va hac » van hac, va khac, va cac
co cua » con cua, ca cua, cong cua
o hai » co hai, so hai, o lai

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) or (thu sach)) y nang o hai. lieu va hac dan ban thanh co cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thu sach)) y nang o hai. lieu va hac dan ban thanh co cua viet.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thu sach)) y nang o hai. lieu va hac dan ban thanh co cua viet*.