by chance
durch Zufall 
toevallig 
par hasard 
per caso 
por casualidad 
โดยบังเอิญ 
tình cờ 
偶然 | HSK5000 A1+A2+B1 |
|---|
| HSK5000 B2 + C1 |
|---|
| 3938 (adverb: coincidentally / by chance)  I was worried about not being able to find someone to help me, and David happened to show up.  Ich machte mir Sorgen, jemanden zu finden, der mir helfen konnte, und zufällig kam David.  Tôi đang lo lắng tìm người giúp đỡ thì tình cờ David đến. Tôi đang lo_lắng tìm người giúp_đỡ thì tình_cờ David đến . I | was | worry | find | person | help | then | by | chance | David | arrive |