Start by preheating your wok or large pan over high heat (around 400°F/200°C). Prepare all ingredients before cooking (mise en place/paghahanda): slice the pork (baboy) and chicken (manok) into thin, uniform strips, peel and devein the shrimp (hipon), halve the fish balls (bola-bola), and slice the Chinese sausage. Chop the onion (sibuyas), mince the garlic (bawang), julienne the carrots (karot), trim the snow peas (sitsaro), prepare the Chinese celery (kinchay), and slice the napa cabbage (repolyo).
Pour 2 tablespoons of canola oil into the hot wok. Cook the proteins separately, removing each to a clean plate after cooking: start with shrimp for 2-3 minutes until pink (hipon hanggang maging rosas), followed by fish balls for 1 minute until heated through, then longganisa for 1-2 minutes until crispy (hanggang malutong), pork for 2-3 minutes until no longer pink, and finally chicken for 2-3 minutes until cooked through.
In the same wok, still on high heat, sauté garlic and onions (gisa ang bawang at sibuyas) until fragrant, about 30 seconds. Pour in 4 cups of chicken broth and bring to a boil. Add oyster sauce and soy sauce (toyo), stirring to combine.
Add the carrots to the boiling mixture and cook for 1 minute. Add the cabbage and kinchay, cooking for another minute. Add the snow peas last and cook for just 30 seconds to maintain their crispness (hanggang malutong pa rin).
Add the pancit canton noodles to the broth mixture, maintaining high heat. Gently toss the noodles (using tongs or chopsticks to prevent breakage) until they absorb the liquid (hanggang masipsip ang sabaw). Return all cooked proteins to the wok and toss everything together until well combined and heated through. Season with salt and pepper to taste (timplahan ng asin at paminta).
Serve hot with calamansi halves on the side. For best results, consume within 24 hours. If storing, keep in an airtight container in the refrigerator for up to 3 days, reheating in a wok with a splash of water.