Perhaps you should try some spelling variations:
function microbial » functional microbial, formation microbial, nutrition microbial
program function » programme function, programs functional, program foundation
microbial https » microbial hosts, microbial hsp, microbiology https
sampling using » samples using, sampling designs
using program » testing program, using problem, using programming

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

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