They are being live tracked. The problem is the size of the search area. The plane was flying at over 200 metres per second; at an attitude of 10 km. So assuming they know the last point of contact before it started to go down, it would have taken at least 45 seconds to hit the sea. Now factor in that speed and you are looking at a search area of about 30 square kilometres. If it hit the water intact, there would be very little debris on the surface of the water.
Now factor in that they may have had the location 10 seconds before it went down, and you are into a search area of 300 square kilometres.
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