Perhaps you should try some spelling variations:
ionization instrumentation » operation instrumentation, radiation instrumentation, collection instrumentation
instrumentation basic » instrumentation based, instrumentation bus, instrumentation organic
basic functions » basis functions, basis function, basic notions
image spaces » image space, image stacks, image states
gate stack » gate stacks

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ionization instrumentation basic functions ((image spaces) OR (gate stack))~.
• Adding a wildcard symbol may retrieve word variants: ionization instrumentation basic functions ((image spaces) or (gate stack))*.