Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
cua cau » cua cac, cua chu, cua cay
lang xa » lang ha, dang xay, lang van
ve cau » ke cau, va cau, ve cac
va cua » va chua, via cua, ca 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 y ((lang xa) OR (nang x)) hoi. hieu ve cau luc ((va hanh) OR (va danh)) va cua cau~.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((lang xa) or (nang x)) hoi. hieu ve cau luc ((va hanh) or (va danh)) va cua cau*.