Perhaps you should try some spelling variations:
"diseases drug effectors." » "diseases drug effects.", "diseases drugs effects.", "diseases rug effects."
"diseases drag effect." » "diseases drugs effect.", "diseases dr effect.", "diseases dna effect.", "diseases dag effect.", "diseases dung effect.", "diseases drying effect."
"diseases drag effects." » "diseases drugs effects.", "diseases dr effects.", "diseases dna effects.", "diseases drug effects.", "diseases xdrug effects.", "diseases rug effects.", "diseases dag effects.", "diseases dung effects.", "diseases drying effects."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("diseases drug effectors.") or ((("diseases drag effect.") or ("diseases drag effects."))))~.
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• Adding a wildcard symbol may retrieve word variants: (("diseases drug effectors.") or ((("diseases drag effect.") or ("diseases drag effects."))))*.