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

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 fover"))) OR ("typhoid ever"))) OR ("lymphoid fever"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"typhoid fever\") OR (\"typhoid fover\"))) OR (\"typhoid ever\"))) OR (\"lymphoid fever\"))".
• Removing quotes may allow a broader search: (((((( typhoid fever ) OR ( typhoid fover ))) OR ( typhoid ever ))) OR ( lymphoid fever )).
• Adding a wildcard symbol may retrieve word variants: (((((("typhoid fever") OR ("typhoid fover"))) OR ("typhoid ever"))) OR ("lymphoid fever"))*.