Ok, I'll tell you a few mantras of mine that got me lucid at least once.

Classic mantra with classic looking at hands RC and awareness question:

I suddenly ask myself "Wow, am I dreaming?" I look at my hands, examine them, count my fingers without expecting any outcome, do a few more RCs and then this is the mantra:

1. Next time I'm dreaming, I look at my hands and realize I'm dreaming

In English, this rhymes and even if it's long, it works great. It got me lucid on more than one occasion.

2. I'm dreaming - this got me lucid, when in regular dream I heard a voice "I wonder how is it gonna take her to realize".

The ones you are saying
Next time I'm dreaming I pinch my nose (look at my hands, push my thumb through my palm...) any of these are good.

Just don't forget the emotions while you doing any of these. You have to believe they will work because you know you are in a dream.