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