Brushing up on Dzongkha

A week from now I’ll be in West Sikkim. Time to brush up on my Dzongkha. All I remember from my trips to Bhutan are three phrases: kuzu zangpo for welcome, kadrin chhe for thank you, and tashi delek for good luck. Tibetan also has the phrase tashi delek with more or less the same meaning. Fortunately, the omniscient Google pointed me to a Dzongkha phrasebook.