Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tu sach » thu sach, su sach, te sach
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
va danh » va dinh, va dan, va hanh
cho cua » chi cua, cho ca, cho cu
xuc va » duc va, tuc va, luc va
co cua » con cua, ca cua, cong cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky nang cao hoi. hieu va cac xuc va danh ((cho cua) OR (co cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) ky nang cao hoi. hieu va cac xuc va danh ((cho cua) OR (co cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky nang cao hoi. hieu va cac xuc va danh ((cho cua) OR (co cua)) tre*.