In Find and Replace

I have WP Office X3.

Is there a way to put in a word or phrase to Find and then Replace it with a double hard return?  I can not find a thing on it and the Replace will not let me hit Return once or twice to then start the Find and Replace.  I even tried putting in the Replace Box this HRt HRt, but it didn't work either.  In the Reveal codes list of codes is nothing for a hard return.

I have a big WP file with lots of strings of the same words that I want to replace with two hard returns to put a paragraph between the run together sentences I need to clean up from my big copy and paste into this file.