Perhaps you should try some spelling variations:
28electronic computers » electronic computers, electronics computers, electronic computer
22program languages » program languages, programs languages, programs language
2 syntax » _ syntax, a syntax, 3 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: %((22program languages) OR (program language)) %28electronic computers%29 %2 syntax%22.
• Adding a wildcard symbol may retrieve word variants: %((22program languages) or (program language)) %28electronic computers%29 %2 syntax%22*.