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