The evidence is not clear enough.The right part may be ⿱交水.

Here's is a clearer shot from another page in the same document:



This is read "chay", meaning "to fast". The right side is a simplified form of 齋 related to 斎, 斋, 𭤕, 齐 etc. where the top element is 文. We could consider adding the "piě" like stroke to the 文, but most abbreviations in this series do not have it and it is not significant from the point of view of UCV.

That ⿱文木 is a common simplification of 齋 is attested here in the “Tự Điển Chữ Nôm Dẫn Giải”

⿰口𱣅