Perhaps you should try some spelling variations:
compositional problems » computational problems, composition problem, compositional process
program compositional » program composition, program computational, problem compositional
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 problems functional microrna https~.
• Adding a wildcard symbol may retrieve word variants: program compositional problems functional microrna https*.