Collins Chinese Dictionary Plus (3rd edition), 2011:
千方百计(計) qiān fāng bǎi jì do everything in one's power
- 医(醫)护(護)人员(員)千方百计(計)抢(搶)救病人。 Yīhù rényuán qiān fāng bǎi jì qiǎngjiù bìngrén. The hospital staff did everything in their power to save the patient.