For general, non-life-threatening assistance, you must use words like
帮忙 (bāngmáng) or
帮助 (bāngzhù). The distinction is critical:
救命 (jiùmìng) is for saving a life, while
帮忙 (bāngmáng) is for lending a hand. This reflects a cultural directness in language when it comes to matters of life and death.