Perhaps you should try some spelling variations:
"typhoid fever" » "typhoid feuer", "typhoid feher", "typhoid feder", "typhoid fevery", "typhoid fver", "typhoid fover"
"typhoid never" » "typhoid nevery", "typhoid nver", "typhoid nover"
"typhoid ever" » "typhoid every", "typhoid ver", "typhoid over"
"lymphoid never" » "lymphoid nevery", "lymphoid nver", "lymphoid nover"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("typhoid fever") OR ((((("typhoid never") OR ("typhoid ever"))) OR ("lymphoid never"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"typhoid fever\") OR (((((\"typhoid never\") OR (\"typhoid ever\"))) OR (\"lymphoid never\"))))".
• Removing quotes may allow a broader search: (( typhoid fever ) OR ((((( typhoid never ) OR ( typhoid ever ))) OR ( lymphoid never )))).
• Adding a wildcard symbol may retrieve word variants: (("typhoid fever") OR ((((("typhoid never") OR ("typhoid ever"))) OR ("lymphoid never"))))*.