Perhaps you should try some spelling variations:
information instruments » informational instruments, information instrumental, deformation instrument
instruments intra » instruments india, instruments internal, instruments data
intra extensions » integral extensions, interval extensions, central extensions
arrays probing » array probing, rays probing, arrays producing
array imaging » arrays imaging, airway imaging, ray imaging

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

• Performing a fuzzy search may retrieve terms with similar spellings: information instruments intra extensions ((array imaging) or (arrays probing))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information instruments intra extensions ((array imaging) OR (arrays probing)).
• Adding a wildcard symbol may retrieve word variants: information instruments intra extensions ((array imaging) or (arrays probing))*.