Perhaps you should try some spelling variations:
frequency microscopy » frequency spectroscopy, frequency epiduroscopy, frequency microstrip
programme function » programming function, programme action, programs functional
double frequency » complex frequency, allele frequency, single frequency
function double » function due, auctions double, reaction double
https » http

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

• Performing a fuzzy search may retrieve terms with similar spellings: programme function double frequency microscopy https~.
• Adding a wildcard symbol may retrieve word variants: programme function double frequency microscopy https*.