Perhaps you should try some spelling variations:
22programming languages » 3.2programming languages, programming languages, onprogramming language
28electronic computers » electronics computers, optoelectronic computers, electronics computer
programming language » programming languages, program language
electronic computers » electronic commerce
electronic computer » electronics computer, electronics computers, electronic computing
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: %((22programming languages) OR (programming language)) %((((28electronic computers) OR (electronic computer))) OR (electronic computers))%29 %2f syntax%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22programming languages) or (programming language)) %((((28electronic computers) OR (electronic computer))) or (electronic computers))%29 %2f syntax%22".
• Adding a wildcard symbol may retrieve word variants: %((22programming languages) or (programming language)) %((((28electronic computers) OR (electronic computer))) or (electronic computers))%29 %2f syntax%22*.