When you create or edit the search index please make sure you have selected all content to be indexed. Here is the related documentation
. The words in your site are counted as static html and there is a checkbox for this in the search index dialog.
I think the problem comes from some content not being reindexed. Go to Administration->Search and Indexes and click Actions on the search index then Reindex. Some time will be needed to reindex the whole site and then all items should be searchable.
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