Perhaps you should try some spelling variations:
structures microarray » structure microarray, structured microarray, studies microarray
program structures » program structure, protein structures
microarray https » microarrays https, microarray chips, microscopy https
interface david » interface device, interface based, interface api
david program » aid program, dvd program, based program

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

• Performing a fuzzy search may retrieve terms with similar spellings: interface david program structures microarray https~.
• Adding a wildcard symbol may retrieve word variants: interface david program structures microarray https*.