Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
mang xa » lang xa, mang may, dang xay
xuc va » duc va, tuc va, luc va
di cua » dai cua, doi cua, de cua
va cao » va co, va dao, va bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((mang xa) or (nang x)) hoi. hieu ((va cao) OR (va cac)) xuc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((mang xa) OR (nang x)) hoi. hieu ((va cao) OR (va cac)) xuc va hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((mang xa) or (nang x)) hoi. hieu ((va cao) OR (va cac)) xuc va hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((mang xa) or (nang x)) hoi. hieu ((va cao) OR (va cac)) xuc va hanh di cua tre*.