The Resonance Journal is designed specifically to help you see connections – both between readings, and also between readings and other experiences, like dreams or synchronicities.
The tools to find connections between entries are found in the tabs of the right sidebar: the tag list and tag cloud, from which you can open the tag information window, and (for Yijing reading entries) cast history.
You can also use advanced search to explore such things as connections between themes and hexagrams or trigrams.