Perhaps you should try some spelling variations:
ionization instrumentation » operation instrumentation, radiation instrumentation, collection instrumentation
instrumentation theory » instrumentation methods, instrumentation https, instruction theory
basics linear » basic linear, based linear, basics clear
basis linear » basic linear, bases linear, based 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: ionization instrumentation theory design ((((basis linear) or (basics linear))) or (class linear))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ionization instrumentation theory design ((((basis linear) OR (basics linear))) OR (class linear)).
• Adding a wildcard symbol may retrieve word variants: ionization instrumentation theory design ((((basis linear) or (basics linear))) or (class linear))*.