Where does “khoảng trống” come from?

khoảng trống (Vietnamese) comes from Vietnamese trồng, from Proto-Vietic k-lɔːŋ, from Proto-Mon-Khmer kluuŋ — inside, middle.

khoảng trống (Vietnamese): empty space; void; gap; vacuum

Definitions

  1. empty space; void; gap; vacuum

Ancestry of “khoảng trống”, step by step

khoảng trống traces back through two separate lines of ancestry.

via Vietnamese trồng

StepLanguageWordMeaning
1Vietnamesetrồngto plant
2Proto-Vietick-lɔːŋclear; limpid; inside
3Proto-Mon-Khmerkluuŋinside, middle

via Vietnamese khoáng

StepLanguageWordMeaning
1Vietnamesekhoángmineral
2Middle Chinese光—
Every word from Proto-Mon-Khmer kluuŋ →Every word from Proto-Vietic k-lɔːŋ →Every word from Vietnamese trồng →