Perhaps you should try some spelling variations:
program compositional » program composition, program computational, program recomposition
problem compositional » problem computational, problem positional, problems computational
problems functional » problem functional, problems functions, problem functionals
functional microrna » functional microbial, functional micro
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: ((program compositional) OR (problem compositional)) problems functional microrna https~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((program compositional) OR (problem compositional)) problems functional microrna https".
• Adding a wildcard symbol may retrieve word variants: ((program compositional) OR (problem compositional)) problems functional microrna https*.