Yes, there are a few guides around the net for which word works for which girl. I think one of them was on the wikia.
After realizing this was an ARG, I started looking around in the files that were easily accessed. One such file "game\scripts.rpa", when opened has an opening poem "There's a little devil inside all of us." When you scroll down, there is a bunch of RENPY [garbage] for whatever reason. If you scroll even further down to line 4149, you'll get access to winning words for each of the three girls.
The interesting part is that it appears each word bears more weight depending on the act. Where Sayori seems to get the most impact in act 1, Natsuki in act 2, and Yuri in act 3. Oddly enough, Yuri has a lot of words that are 1,1,3 when chosen. So it seems especially difficult to draw her attention in act poems 1 and 2 if you accidently pick Sayori/Natsuki words. That being if each word, the number indicates a value and is totaled at the end of the poem creation.
Now that I'm reviewing the file again. At the bottom, there is huge section of characters. I just took it to a Base64 converter and found out that it's the small wooden box story. Heh, go figure.
Yeah, I meant to say the poem portions of the 1st, 2nd and 3rd poems you're to create in Act 1. I wrote too fast and didn't go over what I had written. For example
Candy1,3,2
I'm guessing this means that for Natsuki, Candy would only add +1, +3, or +2 points to the total poem score depending on which poem this was being written for in the 1st act.