Perhaps you should try some spelling variations:
functional microrna » functional microbial, functional micro
program functional » programs functional, program functionality, program national
integer problem » integer program, integrated problem, integrates problem
problem program » problems programs, program program, problem problem
microrna https » microrna snps, microarrays https, microrna shuttle

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

• Performing a fuzzy search may retrieve terms with similar spellings: integer problem program functional microrna https~.
• Adding a wildcard symbol may retrieve word variants: integer problem program functional microrna https*.