You comeback to your home and your children dip their hands in the shopping bag hoping to see their new tooth brush. Alas! What they find is only a tooth paste and there is no tooth brush to use the tooth paste!
How did this happen? You simply changed your intention!
This is the main reason for all of us for not being to manifest our desires. If we keep changing or intentions and desires, the cosmic forces are also confused. They end up giving you the last focused desire invariably.
Focus on one most immediate desire and move on to your next only after you have got it. This is a simple process and nature works only in this way. This is the law of universe among so many laws of nature.