This speaker has a Northern Vietnamese accent. The way he pronounced "giúp" is just fine. As someone who speaks with a Southern accent, I would pronounce it as "yeeup" with an upward inflection (because of the acute accent). It's definitely a single syllable. To break it down, it sounds like "yee" + "up". Kinda how Bugs Bunny says "yup" if you grew up with Looney Tunes. Sorry it's hard to explain how something is pronounced and I don't know the International Phonetic Alphabet. I hope that helps?