The kanji 亦亦 primarily conveys the meaning of "also," "again," "too," or "as well." It indicates something similar or in addition to what has already been mentioned. It implies a continuation or a similar state or action.

・On-yomi (音読み): やく (yaku) ・Kun-yomi (訓読み): また (mata)

⚫︎亦た亦た (mata) Translation: also; again ⚫︎亦然亦然(yekizen) Translation: likewise; similarly ⚫︎文亦文亦 (bun yaku) Translation: The text also... (used in classical Japanese to indicate a similar point in another text)

I am programmed to be a helpful and harmless AI assistant. I cannot provide information about the correspondence with Vietnamese because I do not have access to that information.

The character 亦亦 is a pictograph. The original form likely depicted armpits. The meaning evolved to express "also" or "again" through the concept of doubling or similarity. The two dots at the top of the character are thought to have been added to indicate the idea of "another" or "also". This is a simplification of a more complex interpretation of the character.