調 查 diào chá : investigation; inquiry; to investigate; to survey; survey; (opinion) poll

調 查 結 果 diào chá jié guǒ : results (of an investigation, poll)

進 行 調 查 jìn xíng diào chá : to carry out an investigation

聯 邦 調 查 局 lián bāng diào chá jú : FBI (Federal Bureau of Investigation)

專 案 組 zhuān àn zǔ : special (legal|judicial) investigations group