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