Database Software

Hello, I'am trying to introduce a plus symbol (+) into my thesaurus, for define I+D, for example:

I+D
NT I+D+R
NT D+I

The problem is the result of this symbol:

select ctx_thes.nt('I+D',1,'thes_cs') from dual;

This select returns this results:

(&{D})

Anyone knows why I+D is "translated" to this expression????

Thank you and best regards