Cannot search glossary term that is more than one word

I am using RH 10 and have a list of glossary terms included in the project.  Many of the glossary terms  are more than one word.  To search a glossary term, I can type the first word in but when I hit the space bar nothing happens.   Since this behavior isn't always consistent it seems that there is something else going on here.  Has anyone else had this problem?