A Logos search for "a rose by any other name would smell as sweet" will not register a hit in The Complete Shakespeare because the quote spans two lines of verse, lines which in the Logos text are serparated by intervening spaces and a line number.
In other words, the Logos implementation of this text does not appear to recognise phrases which are broken by a line break as contiguous for the purpose of searching.
This makes it a bit difficult to pinpoint a favourite quote!