Where does “tâm sức” come from?

tâm sức (Vietnamese) comes from Vietnamese sức, from Proto-Vietic k-rək, from Old Chinese 力.

Ancestry of “tâm sức”, step by step

tâm sức traces back through two separate lines of ancestry.

via Vietnamese sức

StepLanguageWordMeaning
1Vietnamesesứcstrength; power
2Proto-Vietick-rəkstrong
3Old Chinese力—

via Vietnamese tắm

StepLanguageWordMeaning
1Vietnamesetắmto wash a body, usually your own; to bathe, to...
2Chinese心heart, mind
3Proto-Mon-Khmersəm—
Every word from Old Chinese 力 →Every word from Proto-Vietic k-rək →Every word from Vietnamese sức →