Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
y tang » ky tang, 6 tang, 7 tang
va cam » va cham, va cac, va cao
va dao » ca dao
ve cam » ve cham, ve cac, ve cai
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de 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 tang ma hoi. hieu ((((ve cam) OR (va cam))) OR (va dao)) thuc va hanh di cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach y tang ma hoi. hieu ((((ve cam) or (va cam))) or (va dao)) thuc va hanh di cua tre*.