Perhaps you should try some spelling variations:
radiation instrumentation » ionization instrumentation, operation instrumentation, radiation instruments
instrumentation theory » instrumentation methods, instrumentation https, instruction theory
theory decision » theory design
basis linear » basics linear, basic linear, bases linear
mass linear » bases linear, class linear, less linear

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

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