Words separated by spaces behave as if they had a logical AND between them. Words separated by commas behave as if they had a logical OR between them.
| 
                     Search String  | 
                
                     Matches  | 
            
| 
                     hello, world  | 
                
                     Documents that have either hello OR world somewhere in the document  | 
            
| 
                     hello world  | 
                
                     Documents that have both hello AND world somewhere in the document  | 
            
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