I would like to know what will happen if a player doesn't have any matching tiles in his later turns?
My totally and completely unofficial answer is just pass - this is what is done in most games and is the simplest answer.
Also, could a player deliberately pass a turn, even though he has matching tiles?
Again, my totally and completely unofficial answer is yes. The alternative is that in the case where the player couldn't play he would have to reveal his tiles to the other players to prove he couldn't play, which defeats the purpose of keeping them hidden. However... I've found when playing with younger kids (and some adults) that they may simply be missing a play somewhere and some help is all that is needed. Utimately, do what is FUN for your group.