What if research does not fetch good results A friend of mine is pursuing a Masters course containing a research dissertation as part of the curriculum. He has done a lot of work on his topic (both studying of existing literature as well as tried out some new methods) but none of them have given interesting results. So, what should his thesis describe? Or does he need to succeed in order to pass?
This depends on the program, the committee, the advisor, and the student. To give some anecdotes in both directions:

I have a friend who was a graduate student for a young professor who was just setting up his lab. My friend never performed any novel research, published few peer-reviewed articles, and for the most part did much more work setting up the lab environment than should have happened. Towards the end of his 5th year, he took his publications, white papers, and other documents, stapeled them together, and called it a thesis. He graduated no problem.

A different friend of mine was diligentily working on a single research problem for a few years and didn't find any results. Push came to shove, his committee wanted to see progress on one particular area, and six months later, when he didn't produce, he left with a masters.

Two separate stories, two separate universities, two very different programs. Long story short, if you think you're heading towards a situation like this, talk to your advisor and committee members and see what you can do. Do note that in these situations you can often take a minor finding which does not directly address your central theme and present it as your major contribution to the field, as this can serve to demonstrate your proficiency in research.