Perhaps you should try some spelling variations:
28electronic computers » electronic computers, electronics computers, electronic computer
programming languages » program language
programming language » program language
2f syntax » 2 syntax, f syntax, 2a syntax

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: %((22((programming language) OR (programming languages))s) OR (((programming language) OR (programming languages)))) %28electronic computers%29 %2f syntax%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22((programming language) OR (programming languages))s) or (((programming language) OR (programming languages)))) %28electronic computers%29 %2f syntax%22".
• Adding a wildcard symbol may retrieve word variants: %((22((programming language) OR (programming languages))s) or (((programming language) OR (programming languages)))) %28electronic computers%29 %2f syntax%22*.