RoboHelp 11 glossary with terms of several words, sometimes only first word is marked

Hi

I'm using RoboHelp for a long time and now version 11. I have a big problem with glossary. I'm generating marked terms automatically. I have some terms of several word. For example my glossary has terms "Virtual" and "Virtual computer". The problem is that, if I have the text "bla bla bla Virtual computer bla bla bla", sometimes only "Virtual" is marked (wrong) and sometimes in other rubrics "Virtual computer" is entirely marked (and I want only that feature).

Could you help me or explain me?

Thanks

Boris.