Perhaps you should try some spelling variations:
information requirements » nutrition requirements, irrigation requirements, information environments
requirements coatings » requirements meetings, requirements change, requirements changes
dispersion method » inversion method, conversion method
immersion method » inversion methods, conversion method

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• Performing a fuzzy search may retrieve terms with similar spellings: information requirements coatings ((dispersion method) or (immersion method)) laser~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information requirements coatings ((dispersion method) OR (immersion method)) laser.
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