Perhaps you should try some spelling variations:
"sideslip quantitative estimation" » "sideslip quantitative description", "sideslip quantitative detection", "sideslip quantitative determination", "leadership quantitative estimation", "design quantitative estimation", "step quantitative estimation"
"sideslip quantitative evaluation" » "leadership quantitative evaluation", "design quantitative evaluation", "step quantitative evaluation"
"sideslip quantile estimation" » "sideslip quality estimation", "sideslip angle estimation"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("sideslip quantile estimation") OR ((("sideslip quantitative estimation") OR ("sideslip quantitative evaluation")))).
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• Removing quotes may allow a broader search: (( sideslip quantile estimation ) or ((( sideslip quantitative estimation ) OR ( sideslip quantitative evaluation )))).
• Adding a wildcard symbol may retrieve word variants: (("sideslip quantile estimation") or ((("sideslip quantitative estimation") OR ("sideslip quantitative evaluation"))))*.