As Carlos says, both sentences sounds weird so we do not understand. Perhaps if you were to add the context behind them, it'd help. Example: Let's say you realize you did not buy enough syrup for the pancakes. You *did* buy *some* syrup, just not enough, because you were in a rush to get in line since the store was about to close, and you could not think straight. So your girlfriend complains: "Hey, why didn't you buy more syrup?" Then you say "I could have (bought) more of it, if I had got there in time."

How is this resolved, but has no answers? Interesting.

I just wanted to know how should i say the thing suppose any target that i wished to get but i couldn't so how i would describe it I would say"i could have"or"i would have" But i've got u it's "i could have had" Right?

I would say none but I don’t really know what you mean. What you want to say must be: I could have had some extra quantity of it if I had got there on time.