Perhaps you should try some spelling variations:
ionization instrumentation » operation instrumentation, radiation instrumentation, collection instrumentation
instrumentation general » instrumentation energy, instrumentation external, instrumentation control
general directions » general elections, general reflections, general collections
image stacks » gate stacks, image space, image tricks
gate » gale, gae

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 general directions ((image stacks) or (((gate OR game) or gave) stacks))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ionization instrumentation general directions ((image stacks) OR (((gate OR game) OR gave) stacks)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ionization instrumentation general directions ((image stacks) or (((gate OR game) or gave) stacks))".
• Adding a wildcard symbol may retrieve word variants: ionization instrumentation general directions ((image stacks) or (((gate OR game) or gave) stacks))*.