指定した検索語 - (("elliptic operator make studies.") or ("elliptic operators case studies."))* - に合致する資料はありませんでした。

少々検索語を変更した方が良いでしょう。:
"elliptic operator make studies." » "hypoelliptic operators make studies.", "elliptic operator case studies.", "elliptic operator main studies.", "elliptic operator based studies.", "elliptic operator lake studies.", "elliptic operator mande studies.", "elliptic operator image studies."
"elliptic operators case studies." » "hypoelliptic operatorss case studies.", "elliptic seperators case studies.", "elliptic operators a studies.", "elliptic operators chapter studies."

検索結果が意図したものでない場合は、検索語を変更してもう一度検索してください。