Man pages matching name xmvacreatecombinationbox2 in section 3:

XmVaCreateCombinationBox2.3.en	debian 10 / libmotif-dev
XmVaCreateCombinationBox2.3.en	debian 11 / libmotif-dev
XmVaCreateCombinationBox2.3.en	debian 12 / libmotif-dev