| focused research(expression, research, investigation, learning) |
| formal investigation(expression, information, investigation, inquiry) |
| cross-examination(noun, expression, study, knowledge, investigation) |
| going-over(noun, expression, study, knowledge, investigation) |
| analytic investigation(expression, information, investigation, inquiry) |
| audit(noun, study, knowledge, investigation) |
| back investigation(expression, information, investigation, inquiry) |
| biodiversity research(expression, research, investigation, learning) |
| center of thought(expression, research, investigation, learning) |
| challenge(noun, study, knowledge, investigation) |
| check(noun, study, knowledge, investigation) |
| checkup(noun, study, knowledge, investigation) |
| commercial inquiry(expression, information, investigation, inquiry) |
| conduct investigation(expression, information, investigation, inquiry) |
| crime investigation(expression, information, investigation, inquiry) |
| criminal investigation(expression, information, investigation, inquiry) |
| diagnosis(noun, study, knowledge, investigation) |
| district of investigation(expression, information, investigation, inquiry) |
| feeler(noun, study, knowledge, investigation) |
| frontline of research(expression, research, investigation, learning) |