[MonetDB-users] tijah phrase search problem

The following query: tijah:queryall("//p[about(., 'drug treatment')]") returns a number of results from my sample document. Some of these results contain the phrase "drug misuse". The following query: tijah:queryall("//p[about(., 'drug misuse')]") returns zero results from the sample document, which is clearly incorrect since some results returned by the first query should be returned by the second. I have deleted and reloaded the sample document and I have recreated the tijah index and the result is consistently incorrect. Is this a bug? -- Roy