Perhaps you should try some spelling variations:
ionization instruction » cognition instruction, operation instruction, ionization instrumentation
instruction theory » introduction theory, institutional theory
theory decision » theory design
basic number » case number
basic linear » quasi linear, basic life

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 decision ((((basic number) OR (basic linear))) OR (less linear))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ionization instruction theory decision ((((basic number) OR (basic linear))) OR (less linear))".
• Adding a wildcard symbol may retrieve word variants: ionization instruction theory decision ((((basic number) OR (basic linear))) OR (less linear))*.