add better search func in vocabulery docs

[Rafi-Riday]

This Func will accept search strings in any orders to be matched with target string

function search(str,src) {
    let state = true;
    if (state === false) return false;
    src.split('').forEach(s=>{
        str.includes(s) ? state = true : state = false;
    })
    return state;
}