Hi @Anonymous,
Have you solved your problem?
Do you want to filter the Gallery based on search box with multi strings?
Could you please tell me that if you want both the strings you input or either of them you input?
If you want to filter the records that including python and java in a column at the same time, you should try to set the Gallery Items property as below:
Filter([@Actions], TextSearchBox1.Text in MultiLine)

If you want to filter the records that including python or java, you should refer to the formula from @CNT.