Perhaps you should try some spelling variations:
"typhoid fever" » "typhoid feuer", "typhoid feher", "typhoid feder", "typhoid fevery", "typhoid fver", "typhoid fover"
"lymphoid fever" » "lymphoid feuer", "lymphoid feher", "lymphoid feder", "lymphoid fevery", "lymphoid fver", "lymphoid fover"
"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.

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