amulet 3sin / 3trap

On amulet is either 2 sin or 3 to traps.
3 to sin is not possible.
And yes is possible to spawn with str, it is called "of Atlas" with +21-30 to Strength

There are also crafted amulets that have 2 sin + str and other stats.
But 3 to traps is only if it has 1 other stat, like fcr, life, str etc. example 3 to traps + 10fcr or 3 to traps and 25str.
If is more stats like life, str, fcr, res etc, then can only spawn +2traps or +2 sin.

So im guessing, if i look at your question, that you ask if it is possible for a 3 to trap amulet to spawn with more than 1 stat including str.
If that is what you are asking, then the answer is no.