Perhaps you should try some spelling variations:
"complex a simulators from" » "complex a simulation from", "complex _ simulations from", "complex _ simulators from", "complex 3d simulators from"
"complex a simulated from" » "complex a simulation from", "complex a isolated from", "complex _ simulated from", "complex 3d simulated from"
"complex a equation model" » "complex a simulation model", "complex _ equation model", "complex heat equation model", "complex wave equation model", "complex 3d equation model"

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("complex a simulators from") OR ("complex a simulated from"))) or ("complex a equation model"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("complex a simulators from") OR ("complex a simulated from"))) OR ("complex a equation model")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"complex a simulators from\") OR (\"complex a simulated from\"))) or (\"complex a equation model\"))".
• Removing quotes may allow a broader search: (((( complex a simulators from ) OR ( complex a simulated from ))) or ( complex a equation model )).
• Adding a wildcard symbol may retrieve word variants: (((("complex a simulators from") OR ("complex a simulated from"))) or ("complex a equation model"))*.