Difference between “here and there” and “here, there and everywhere”

here and there—in various places; scattered about:

• The old birch-woods still linger here and there.

Note: The expression is not antonymous in meaning to the phrase neither here not there—used of smth. not very important or irrelevant to what is being discussed:

• This may be neither here nor there but I have to say it.

here, there and everywhere—in all parts; in every place imaginable:

• I’ve been looking for you here, there and everywhere.