In Vietnamese, like many Asian languages, nouns require classifier words to be counted.

Where in English we say “two boxes” in Vietnamese they say “hai cái hộp”, translated “two thing-classifier box”.

For “one cup of coffee” the Vietnamese is “một ly cà phê” or “one glass/classifier coffee”. Classifiers are nearly always required, but many times a noun can also function as a classifier.
today, lets learn more about “thằng” and “con”