Perhaps you should try some spelling variations:
problems functionality » problem functional, problem functionals, program functionality
protein functionality » protein functional, proteins functional, properties functionality
interface security » interfaces security, internal security, interface secure
microarray chips » microarray chip, microarrays chip, microarray cross

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

• Performing a fuzzy search may retrieve terms with similar spellings: interface security ((problems functionality) OR (protein functionality)) microarray chips~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "interface security ((problems functionality) OR (protein functionality)) microarray chips".
• Adding a wildcard symbol may retrieve word variants: interface security ((problems functionality) OR (protein functionality)) microarray chips*.