Okay. It may be the the full text of the affected pages did not properly get put in the database. This is due to an issue discovered with determining page character sets. This is corrected in 3.6.0, but there is an easy hack for 3.5.2.
In admin/spider.php, line 484, find:
$fulltxt = removeEmoji($fulltxt); // Remove emojis
Comment out this line, as such:
// $fulltxt = removeEmoji($fulltxt); // Remove emojis
Then, on the sites screen, Options. Then Clear site. Finally, do a full index. The full text should then be present.
Do not just do a Re-index. Since pages likely have not changed, the full text will not be picked up.
(In the event you prefer to update to 3.6.0, you will still need to Clear site and do a fresh full index.)
If the issue persists, post back. We WILL get you fixed up!