家宅捜査[katakusousa] premises search
家宅捜索[katakusousaku] premises search
あら捜し[arasagashi] finding fault
捜し求める[sagashimotomeru] to search for
捜し当てる[sagashiateru] to find out

捜査[sousa] search (esp. in criminal investigations)
捜査当局[sousatoukyoku] investigating authorities
捜査本部[sousahonbu] (criminal) investigation headquarters
捜索[sousaku] search (esp. for someone or something missing)
連邦捜査局[renpousousakyoku] Federal Bureau of Investigation