Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
xang xa » lang xa, mang xa, ang xa
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
va cao » va co, va dao, va bao
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua
cua te » cua tu

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

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