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