These thematic pictures of មនុស្ស are analogous to a visual dictionary. The theme "មនុស្ស" splits into several parts. For children, especially toddlers from 1 to 5 years old, it is better to divide the sets of cards over several days, or even weeks, so the information is absorbed better. Especially it is true if you are using flashcards to learn the khmer language, which is not your native language.
To expand your khmer language vocabulary on the "មនុស្ស" topic, flashcards games are the best way: