Options: search range
You can choose to search the entire tree or only a selected subtree. If you select the latter, search will be limited to the subtree (root node and child nodes at all levels) of the node that has is currently selected in the Tree pane. This is a very useful way to save time and avoid being flooded with irrelevant results.
You can choose to search only node titles, only article text, or both, by checking the appropriate boxes.
If you are using TreePad Business Edition, you will see a checkbox enabling you to limit your search to only checkmarked nodes. This helps to narrow your search.