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 equation model" » "complex a simulation model", "complex _ equation model", "complex heat equation model", "complex wave equation model", "complex 3d equation model"
"complex a simulated from" » "complex a simulation from", "complex a isolated from", "complex _ simulated from", "complex 3d simulated from"

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