Perhaps you should try some spelling variations:
communication instrumentation » communication documentation, communication interpretation, ionization instrumentation
instrumentation methods » instrumental methods, instrumentation https, documentation methods
methods division » methods decision, methods vision, methods diffusion
masks linear » mass linear, bases linear, basis linear
class linear » less linear, mass linear, class library

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication instrumentation methods division ((masks linear) or (class linear))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication instrumentation methods division ((masks linear) OR (class linear)).
• Adding a wildcard symbol may retrieve word variants: communication instrumentation methods division ((masks linear) or (class linear))*.