Hi, Shihab. Here are two different ways I would say this: "I searched everywhere in my house but could not find where the voice was coming from." "I searched everywhere in my house but could not figure out where the voice was coming from." You don't need to say "invisible" when referring to the voice since a voice is sound and cannot be seen anyway. You could say "the mysterious voice" to imply it was unknown to you. I hope this helps.

"I've searched for the invisible voice everywhere in my house but couldn't find it." "Is it correct?" (Not "Was it correct". Also, there is no need for "to you" since the question is directed to us implicitly.)

It's definitely understandable! You should say "I searched everywhere in my house" rather than "of my house". I would probably word it more like this though: "I searched throughout my entire house but the invisible voice was nowhere to be found." Although there are some that would disagree with my phrasing as well XD