My first pair did not like each other at first. They had a good first date, but then after that they would fight immediately in bonding sessions. I eventually did bond them after about 3.5 months, and they were madly in love. LOL
So, yes, most bonds are possible, they just take more time. Not every pairing will work out though, and sometimes it may not be worth the stress.
Can you describe your situation a bit more? There are a number of things you can try with bunnies that are harder to bond. Experimenting with the location and size of the bonding area is a good first step. The more difficult the bond, the more important it is for the location to be very unfamiliar.
More pre-bonding can also help, as it gives them time to get more used to each other without the stress of the bonding sessions.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.