Perhaps you should try some spelling variations:
3.2programming languages » programming languages, onprogramming language, progamming languages
28electronic computers » electronic computers, electronic computer, optoelectronic computers
electronics computers » electronic computers, electronics computer, electronics chapter
programming language » programming languages, program language
2f syntax » 2 syntax, 2a syntax, 2.1 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: %((3.2programming languages) OR (programming language)) %((28electronic computers) OR (electronics computers))%29 %((2f syntax) OR (f syntax))%22.
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• Adding a wildcard symbol may retrieve word variants: %((3.2programming languages) or (programming language)) %((28electronic computers) or (electronics computers))%29 %((2f syntax) OR (f syntax))%22*.