cypher - Neo4J query to join multiple matches to return results -

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when run query below query 1 producing result returning categories label document documents. note document can have multiple categories hence collecting them in on go.

start doc = node:entities(type = "document-link") match  category-[:category]-doc<-[:`document-link`]-id return    doc.title    title,   collect(coalesce(category.category, "")) categories

query 2 producing result returning language of document documents. document can have 1 language type. 

start  doc = node:entities(type = "document-link") match  lan-[:language]-doc<-[:`document-link`]-id return    doc.title    title,   lan.language language

query 3 join of 1 , 2 producing empty result. can highlight doing wrong?

start  doc = node:entities(type = "document-link") match  category-[:category]-lan-[:language]-doc<-[:`document-link`]-id return  doc.title    title, lan.language language, collect(coalesce(category.category, "")) categories

in third query match on relation between category , language, don't in first 2 queries. how this:

start  doc = node:entities(type = "document-link") match category-[:category]-doc<-[:`document-link`]-id match doc-[:language]-lan return  doc.title    title, lan.language language, collect(coalesce(category.category, "")) categories

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