When searching mulitple terms, observations containing all the terms are not returned.

[arisf]

Consider the observation with ID = hipc-inf-ctf-32514047-5-0.

This observation contains the following two subjects:

• myeloid suppressor cell
• Severe acute respiratory syndrome coronavirus 2

When searching with search text:

myeloid COVID19

the search results do not include this observation, despite the fact that the first query term matches the first subject and the second query term matches the second subject.

[zhouji2013]

The logic of finding the observations seems not the problem. If we search "myeloid coronavirus", the observation is returned. The problem is that the subject (Severe acute respiratory syndrome coronavirus 2) can be found by searching "coronavirus", but not by searching "COVID19". I think the cause is this: although we do support searching by synonyms now, we have three different types of synonyms (Broad Synonyms, Exact Synonyms, and Related Synonyms), and currently searching only uses "Broad Synonyms". COVID19 is an "Exact Synonym". I will add Exact Synonyms in the searching process and expect that will solve this issue.