I think "唔該" fits better in this scene. so the whole sentence would be "唔該，（請問）呢樣（=this）/果樣（=that）嘢（=thing）用中文點講啊？”

唔好意思,尼/果 樣野用中文點講呀? Excuse me=唔好意思 pointing at something=尼/果 樣野 how to say this in chinese?=用中文點講呀?

http://tdc.putonghuaonline.com/tools1.html kick 廣東話 ,put any word and then kick 即時發音

唔該我想問 依樣野中文點講呀