Perhaps you should try some spelling variations:
22programming languages » 3.2programming languages, programming languages, onprogramming language
28electronic computers » electronic computers, optoelectronic computers, electronics computer
electronics computers » electronic computers, electronics computer, electronics chapter
programming language » programming languages, program language
electronic computer » electronic computers, electronics computer, electronic computing
2f syntax » 2 syntax, f syntax, 2a syntax

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: %((22programming languages) OR (programming language)) %((((28electronic computers) OR (electronic computer))) OR (electronics 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 (electronics computers))%29 %2f syntax%22".
• Adding a wildcard symbol may retrieve word variants: %((22programming languages) or (programming language)) %((((28electronic computers) OR (electronic computer))) or (electronics computers))%29 %2f syntax%22*.