Thanks sir/madam for your inputs. This vanda rebloomed to me after more than 6 months (bought it last february with flowers).
My Vanda Rothschildiana already formed her long spike and buds and hoping in less than two weeks it will show her beauty. I'll update you again guys. Thank you.
Another update - My Vanda Rothschildiana is now in flower (though flowers looks not so perfect - probably because of those ant that feast and bite on the buds 24/7)
Spike is very long and flowers are almost separated from the plant (the same when I bought it with blooms)