Perhaps you should try some spelling variations:
communication instrumentation » communication documentation, communication interpretation, ionization instrumentation
theory division » theory decision, theorems division, theory diffusion
theory revision » theory decision, theory revisited, theory session
masks linear » mass linear, bases linear, basis linear

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 ((theory division) OR (theory revision)) masks linear~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "communication instrumentation ((theory division) OR (theory revision)) masks linear".
• Adding a wildcard symbol may retrieve word variants: communication instrumentation ((theory division) OR (theory revision)) masks linear*.