Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau luc » cau truc, cau phuc
hai cua » thai cua, dai cua, hoi cua
lai cua » dai cua, lai chau, thai cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
luc va » duc va, tuc va, loc va
ve cau » ke cau, va cau, ve cac

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: thu sach y ((nang xa) OR (nang x)) hoi. hieu ve cau luc va hanh ((lai cua) OR (hai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) or (nang x)) hoi. hieu ve cau luc va hanh ((lai cua) OR (hai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang xa) or (nang x)) hoi. hieu ve cau luc va hanh ((lai cua) OR (hai cua)) tre*.