Perhaps you should try some spelling variations:
formulation constraint » formation constraint, correlation constraint, permutation constraint
functions formulation » function formulation, fraction formulation, functions permutation
microarray profiling » microrna profiling
array string » array strong, arrays strings, array sharing

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

• If you are trying to use Boolean operators, they must be ALL CAPS: functions formulation constraint programming ((array string) OR (microarray profiling))~.
• Adding a wildcard symbol may retrieve word variants: functions formulation constraint programming ((array string) or (microarray profiling))*.