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The Japanese word

捜査

is pronounced
sousa | そうさ
means
investigation
Examples:
犯罪捜査への協力を要請された。
hanzai sōsa e no kyōryoku o yōsei sa re ta.
I was asked to cooperate with them for the criminal investigation.
捜査を立ち消えにしてほしくない。
sōsa o tachigie ni shi te hoshiku nai.
I don't want the investigation to burn out.
Examples sourced from tatoeba.org