These thematic pictures of Phương tiện giao thông are analogous to a visual dictionary. The theme "Phương tiện giao thông" 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 vietnamese language, which is not your native language.
To expand your vietnamese language vocabulary on the "Phương tiện giao thông" topic, flashcards games are the best way: