When I search in my web guide, it does not search for bookmarks or topics, only book titles. How can I change this setting so that it searches for bookmarks and topics as well?

The search looks at the content of topics (I believe including meta tags such as meta description or meta keywords, but I'm not sure about anchor tags). The ToC is simply a navigation aid, so cannot itself be searched on (my intepretation, not an official description )

Because you only get 4 results, I assume you just have a few topics containing multiple headings (so a topic "Getting Started" which contains headings for Login, Navigation Bar, Date & Time and Tabs) which you have separately added to the ToC.

You have search highlight turned on, so the applicable words will be highlighted when you go into the topic so you can easily find each occurance in the topic.

If you would like Login, Navigation Bar etc to show up as separate results in search, you will need to split that information into separate topics.

HTH