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I have two oscars.They are very active when i am about to put food..but after they eat some food they  come to the bottom of the tank and fall on the mud as if they dont have strength.Then there is very less movement they are in the same place...Is this normal or what??

Not unusual!  How big a tank are your O's in?  How big are they?

I have a 4 feet tank..My oscars are about 9 inches.....

Do you check your ammonia/nitrite/nitrate readings regularly?  Your O's are getting to a size now where they can stress the bioload in a 4-foot tank.  Be sure everything is OK, and keep up with your water changes, but the behavior doesn't sound too aberrant.

No not too regularly..

Will my oscars breed at this time..

Well, they're big enough.  Whether you have a male and a female is another question.  Water quality is paramount.

I first had two females.Then i got a male for them ...Now i have left one of the female with the male...