There are times when a block of text can uniquely identify an item. Perhaps it is a line of text from a product description or a title.
To find an item using a block of text, use ItemSearch'sTextStream parameter, for example,
TextStream=It%20was%20the%20best%20of%20times%20and%20the%20worst%20of%20times.
The search engine picks out of the text block up to ten keywords and uses those as search criteria. A TextStream request returns up to ten items that match those keywords. Only one page of results can be returned.