Perhaps you should try some spelling variations:
function function » function functional, functions functional, function dysfunction
drupal function » dual function, adrenal function, renal function
parallel using » parallel routing, parallel parking, parallel imaging
function https » functions https, fiction https
using drupal » using drama, using drip, using drugs

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: parallel using drupal function function https~.
• Adding a wildcard symbol may retrieve word variants: parallel using drupal function function https*.