Meaning of xíng zōng:
xíng zōng
行踪
Noun
whereabouts; (lose) track (of)
Wǒmen zhǎodào le tā de xíngzōng.
我们找到了他的行踪。
We found his whereabouts.
Tā xiāoshī le, dàjiā dōu zhǎo bù dào tā de xíngzōng.
她消失了,大家都找不到她的行踪。
She disappeared, and everyone lost track of her whereabouts.