Perhaps you should try some spelling variations:
explain microarray » exploring microarray, plant microarray, exon microarray
integer database » integrated database, internet databases, intelligent database
database objects » database concepts, database project, data objects
microarray https » microarrays https, microarray chips, microscopy https
objects explain » subjects explained

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

• Performing a fuzzy search may retrieve terms with similar spellings: integer database objects explain microarray https~.
• Adding a wildcard symbol may retrieve word variants: integer database objects explain microarray https*.