Perhaps you should try some spelling variations:
22programming languages » 3.2programming languages, programming languages, onprogramming language
28electronic computers » electronic computers, electronic computer, optoelectronic computers
electronics computers » electronic computers, electronics computer, electronic converters
programming language » programming languages, program language
electronics chapter » electronics computer
2a syntax » a syntax, 2 syntax, la syntax
f syntax » _ syntax, 3 syntax, 2 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 (((electronics computers) OR (electronics chapter))))%29 %((2a syntax) OR (f syntax))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22programming languages) or (programming language)) %((28electronic computers) or (((electronics computers) OR (electronics chapter))))%29 %((2a syntax) or (f syntax))%22".
• Adding a wildcard symbol may retrieve word variants: %((22programming languages) or (programming language)) %((28electronic computers) or (((electronics computers) OR (electronics chapter))))%29 %((2a syntax) or (f syntax))%22*.