Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
te sach » toc 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
chi cua » khi cua, cuoi cua, chat cua
chi cuc » thi cuc
xuc va » duc va, tuc va, luc va

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 (te sach)) ky nang cao hoi. hieu va cac xuc va danh ((chi cua) OR (chi cuc)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang cao hoi. hieu va cac xuc va danh ((chi cua) OR (chi cuc)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang cao hoi. hieu va cac xuc va danh ((chi cua) OR (chi cuc)) tre*.