Visual Filters - how to highlight multiple words the same way.

I wanted to setup a visual filter to highlight a number of words in a collection of my books (they aren't Bibles) and I'm struggling to figure out the best way to do so.

They are all going to be highlighted the same way. I was trying to see if I could do so without having to enter each word with it's highlighting formatting individually.

I tried doing multiple words on a line and the results are mixed and also seem to change.

At first I tried word1 OR word2 OR word3 etc but that ultimately didn't work. Some would be highlighted and some wouldn't, and there didn't seem to be any rhyme or reason to it.

Then I noticed that I didn't need to use OR, I could just use a space. So word1 word2 word3, etc. But that had the same problems as using OR.

Then I noticed I could enter 5 words on one line and they were all highlighted. But then after entering a few lines, it would seem that some of the previously highlighted words were no longer highlighted, and I had to add them again.

Any help would be much appreciated. Thanks!