I got the datasheet from the manufacturers website and looked at the pins and their functions.

After, I designed my own simple circuit regardless of noise values.

However, applying that circuit (see circuit labeled 4 in the attached picture) on a breadboard does not give any results.

To get the best out if it you should follow the recommended circuit shown in the datasheet.

The main problem is that you dont have a capacitor on the output, which is required to block DC voltage from getting to the speaker (without it the speaker could draw a high quiescent current, which will reduce its linear range and might burn it out).

The audio signal should be AC coupled to it via a capacitor, to stop DC voltage from upsetting the bias point of the amp.

Its possible that your input source already includes a blocking capacitor, but unless you know exactly what circuit is being used you should not rely on it.

The DC gain is set to 20 in order to keep output voltage offset and drift low.

You can increase the audio gain by putting a lower resistance between pins 1 and 8, but it must be AC coupled via a capacitor to avoid increasing the DC gain.

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Lm386 Amplifier Circuit