Perhaps you should try some spelling variations:
operation instrumentation » applications instrumentation, therapy instrumentation, modern instrumentation
instrumentation general » instrumentation energy, instrumentation external, instrumentation control
general functions » generic functions, central functions, cerebral functions
image stacks » gate stacks, image space, image tricks
gate » gave, game, gae

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

• Performing a fuzzy search may retrieve terms with similar spellings: operation instrumentation general functions ((image stacks) or ((gate or gale) stacks))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: operation instrumentation general functions ((image stacks) OR ((gate OR gale) stacks)).
• Adding a wildcard symbol may retrieve word variants: operation instrumentation general functions ((image stacks) or ((gate or gale) stacks))*.