This is the 9527th most frequent Japanese word.
結びつか
"結びつか" means "to be connected" or "to be tied together."
結びつかない is used here to indicate a lack of connection or correlation between two subjects.
その調査結果は新しい発見と結びつかない。
The survey results do not connect with the new discovery.
結びついている expresses a linkage or connection between an event and a concept.
その出来事は彼の悪い運命と結びついていると思われる。
The event seems connected to his bad fate.
結びつけて illustrates an active process of combining or linking ideas for a purpose.