computer training
Finds all documents containing either of the terms 'computer' or 'training'

computer OR training
Same as above

computer AND training
Finds fewer documents (only those containing both terms 'computer' and 'training')

computer NOT training
Finds documents containing the term 'computer' and not the term 'training'

prog*
Finds documents containing words starting with 'prog' e.g. progress, programs

(summer not preschool) and programs
Finds documents containing 'summer', and 'programs' but not 'preschool'

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