The kanji 換 primarily conveys the meaning of "to exchange," "to change," or "to replace." It implies a shift from one thing to another, whether it's objects, ideas, or positions. This could involve swapping items, transforming something, or substituting one element for another.

・On-yomi (音読み): カン (kan) ・Kun-yomi (訓読み): かえる (kaeru - to exchange, to change), かわる (kawaru - to be changed)

⚫︎ 両替（りょうがえ） Translation: Currency exchange ⚫︎ 交換（こうかん） Translation: Exchange, interchange ⚫︎ 換気（かんき） Translation: Ventilation, airing

I am sorry, but I do not have access to any reliable source of information about the correspondence between the kanji 換 and Vietnamese. Therefore, I cannot provide an explanation of its correspondence with Vietnamese.

The kanji 換 is a phono-semantic compound (形声文字). The left side is the radical 扌, which is the "hand" radical, representing an action related to the hand. The right side is 奐, which functions phonetically and contributes to the meaning. 奐 suggests "bright," "glorious," or "vast." Combining these elements, 換 indicates the action of changing something, perhaps replacing something old with something new or better, implying a positive change or a brighter future. The "hand" radical emphasizes the act of making the change.