Hello gan/sis

I think i have read every single thread in this forum but unfortunately still not finding the answer of my problem.

I have some trouble to improve my english especially about vocabulary.
I have often read some english article, and finding new vocab in every text i read. And then copied it to be translated in google translate immediately.
But, the problem is, why i always forgetting my vocab that i have translated once i want to use it in the next days?

Anybody get same problem? There's a tips for it?

Thanks in advance