Hi Hansik,
You have done the right setting with the relational operator. I would choose this setting only if I have a lot of names of the BPs populated in Name 1 and Name 2 field. Otherwise, I would leave it to be relational operator B setting.
There is another setting on top of the relational operator which you should check out to get around with the single terms and that's the base value. On the same screen where you have done the relational operator setting, look for the setting Display Base Value - "1- Number of terms in Each SPL list name and Partner Name". Please make sure you have this setting, it should take care of the single word hits.
Good luck!
-Shrini