Take a day off from work if you can and get some sleep. Working while sick may draw out your illness. You will get better faster and you won’t put your co-workers at risk of catching your cold if you stay home to recuperate. Keep your kids home from school as well if they catch a cold. Their teacher and all the other kids' parents will appreciate it! These fluids should be water, juices, tea, or clear chicken or vegetable broths. Chicken soup is actually very good for the common cold!  Be sure to drink lots of water. This bit of advice applies all the time, but even more when you have a cold.  At a minimum, try to drink eight to ten 8 ounce glasses of water a day. Coffee, alcohol, sugary "juices," and soda will actually dehydrate you. Peppermint and green tea are full of great antioxidants and help to open passages. You can add honey to soothe a sore throat. Veggies and fruits are always good for you, especially things with Vitamin C like broccoli, oranges, strawberries, spinach, and peppers. Soup and meal replacement shakes are also good, but anything you can keep down is a bonus. Most of the time, there is no need to see a physician.  If, however, you or your child experience any of the following symptoms, call your doctor:  A fever with a temperature higher than 100.4 °F (40 °C).  If your child is younger than 6 months old and has a fever, call your doctor. For children of any age, if the fever is 104 °F (40 °C) or greater, call your physician. If the symptoms last more than 10 days. If the symptoms are severe or you experience unusual symptoms such as severe headaches, nausea or vomiting or difficulty breathing.

TL;DR in Vietnamese:
Dành nhiều thời gian để nghỉ ngơi. Uống nhiều nước. Cố gắng ăn kể cả khi bạn cảm thấy không ngon miệng. Tính đến việc đi gặp bác sĩ.