How does RoboHelp Search function ?

@Cat25794137bhif The thread at https://community.adobe.com/t5/robohelp-discussions/search-anomalies/m-p/11748980#M135360 was written by one of the developers. As you will see, the algorithm is complex but essentially all sorts of factors affect the ranking of the results.

A key word will boost the ranking but the other factors will not be ignored. They simply move the results up or down. Specifically to answer your question, from my understanding of the explanation, the heading results will not be ignored.

You will need to delve more into the link given by VikChand for how the algorithm works.

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My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.

See if this topic and the other one linked in the dsicussion help with your general question about the search algorithm.

https://community.adobe.com/t5/robohelp-discussions/what-s-the-search-results-order-in-a-frameless-output-in-robohelp-2020/m-p/12128467

Adding a keyword in the topic properties won't stop the headings being used in the search algorithm. My understanding is these search keywords would typically be words that don't appear in the body of the topic but that your users are likely to search on when looking for the topic.