This may happen if:
* the site used to block archive.org crawlers or alexa;
* the site asked archive.org to remove it's data;
* it is a new website and wayback machine didn't have chance to visit it yet;
* you limited your search to just one year and no pages were archived in that specific year;
* archive.org is experiencing some temporary issues (server responded with an error status 503 or 504)...
Instructions:
Enter the url of the website archived by Wayback Machine, hit the "Scan!" button and wait while the scanner prepares a list of all archived pages.
You can limit the results to a specific year only.
The sacnner returns maximum of 200,000 pages.
Then you can:
1.) copy all the URLs to clipboard and use MS Excel or another spreadsheet software to filter the list, then use the page text extractor to extract the page texts in bulk (max. 50 urls at once);
2.) click on any page and extract the text of that single page.