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, electronics chapter
programming language » programming languages, program language
2f syntax » 2 syntax, f syntax, 2.1 syntax
2a syntax » a syntax, 2 syntax, la 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 (electronics computers))%29 %((2f syntax) OR (2a 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))%29 %((2f syntax) OR (2a syntax))%22".
• Adding a wildcard symbol may retrieve word variants: %((22programming languages) or (programming language)) %((28electronic computers) or (electronics computers))%29 %((2f syntax) OR (2a syntax))%22*.