Searching via labels vs IDs

Search via ID returns 28 results:

https://neuinfo.org/mynif/search.php?q=%22CL:0000746%22&t=data&b=0&r=20&cf=Images

However, search for the equivalent label returns only 3:

https://neuinfo.org/mynif/search.php?q=%22cardiac%20muscle%20cell%22&t=data&b=0&r=20&cf=Images

I presume this is because CL is not used in OntoQuest? Here is the CL term in obo format:

id: CL:0000746
name: cardiac muscle cell
namespace: cell
alt_id: FMA:83808
def: "Cardiac muscle cells are striated muscle cells that are responsible for heart contraction. In mammals, the contractile fiber resembles those of skeletal muscle but are only one third as large in diameter, are richer in sarcoplasm, and contain centrally located instead of peripheral nuclei." [GOC:mtg_cardiacconduct_nov11, GOC:tfm, ISBN:0323052908]
synonym: "cardiac muscle fiber" EXACT [GO:0048739]
synonym: "cardiac myocyte" EXACT []
synonym: "cardiocyte" BROAD []
synonym: "cardiomyocyte" EXACT []
synonym: "heart muscle cell" EXACT []