Many scientists searched the area , but they ca n't find particles .
Many scientists searched the area , but could n't find particles . Many scientists searched the area but were unable to find particles . Many scientists searched the area , but they could n't find particles . Many scientists searched the area , but they could n't find particles .
Many scientists searched the area , but could n't find particles .
Fix grammatical errors in this sentence: Many scientists searched the area , but they ca n't find particles . Output: