Find similar image inside another image with opencv

I have to understand if an image contains another similar image. Here 2 example:

Inside this image: I need to find this image:

or inside this find this .

The idea is: given an input image and a set of icons find which icon is present in the input image.

I've tried using MatchTemplate and feature matching with ORB and SIFT but I couldn't find any valid matches.

Here my try with MatchTemplate in Go:

package main

import (
    "fmt"
    "image/color"

    "gocv.io/x/gocv"
)

func main() {
    matImage := gocv.IMRead("/Users/pioz/Desktop/samplex.jpg", gocv.IMReadGrayScale)
    // gocv.Canny(matImage, &matImage, 200, 400)
    matTemplate := gocv.IMRead("/Users/pioz/Desktop/eld.jpg", gocv.IMReadGrayScale)
    // gocv.Canny(matTemplate, &matTemplate, 20, 40)
    matResult := gocv.NewMat()
    mask := gocv.NewMat()
    gocv.MatchTemplate(matImage, matTemplate, &matResult, gocv.TmCcoeffNormed, mask)
    mask.Close()
    minConfidence, maxConfidence, minLoc, maxLoc := gocv.MinMaxLoc(matResult)
    fmt.Println(minConfidence, maxConfidence, minLoc, maxLoc)

    gocv.Circle(&matImage, minLoc, 10, color.RGBA{0, 0, 255, 1}, 10)
    gocv.Circle(&matImage, maxLoc, 10, color.RGBA{0, 0, 255, 1}, 10)

    gocv.IMWrite("out/out.jpg", matImage)
}

Do you have any advice or snippet to solve this kind of problem?