That would be something like:
{
field1 as var(func: anyofterms(title, "apple computer com"))
field2 as var(func: anyofterms(firstname, "apple computer com"))
field3 as var(func: anyofterms(lastname, "apple computer com"))
q(func: uid(field1, field2, field3)) {
title
firstname
lastname
products {
model
}
}
}