The *
is special symbol, a wildcard. Similar to regular expressions, it tells Solr to match everything. So querying for bifidum*
would return everything that starts with bifidum. Not what you want, right?
When reading about Solr's query syntax in the manual, you will find a section named Specifying Terms for the Standard Query Parser there is written
A phrase is a group of words surrounded by double quotes such as "hello dolly"
This is what you need ...