Chess is full of surprizing moves......
Learn Online Chess Free - Solve these Chess Positions in your mind first before you hover with your mouse over the diagram to see the solution.
It is not enough to see normal combinations. Every good player sees them. It is more important to find fine positional chess moves that improve your position and accumulate small advantages move by move.
These little moves will add up until you reach a position where you can launch a successful combination because your position is better. If your position is ruined and the energy level of your pieces is cut down then it is highly unlikely that the combinations will end in your favor. This is just common sense, that's all.