What should be the guideline when omitting that in a sentence?
[http://www.manilatimes.net/index.php/news/top-stories/25510-chinese-ship-rams-ph-boat]While China said it would also ask its fishermen to leave the area, it stressed it had no intention of pulling out its bigger ships from there.[/http://www.manilatimes.net/index.php/news/top-stories/25510-chinese-ship-rams-ph-boat]
Because with the phrase while China said it would also ask its fishermen to leave the area, having no 'that' between said and it sounds natural. But with the phrase it stressed it had no intention of pulling out its bigger ships from there, it isn't. Why is that?