nǐ / zhǎo / bié / rén / niē / gu / yě / méi / yòng / zhè / shì / dé / tā / men / liǎ / zì / jǐ / tóng / yì / cái / xíng

你找别人捏估也没用，这事得他们俩自己同意才行。

It's no use asking someone else to act as a go-between for this; they have to agree to it themselves.