Perhaps you should try some spelling variations:
"typhoid fever" » "typhoid feuer", "typhoid feher", "typhoid feder", "typhoid fevery", "typhoid fver", "typhoid fover"
"typhoid ever" » "typhoid every", "typhoid ver", "typhoid over"
"typhoid never" » "typhoid nevery", "typhoid nver", "typhoid nover"
"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 ever"))) OR ((("typhoid never") OR ("lymphoid never"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"typhoid fever\") OR (\"typhoid ever\"))) OR (((\"typhoid never\") OR (\"lymphoid never\"))))".
• Removing quotes may allow a broader search: (((( typhoid fever ) OR ( typhoid ever ))) OR ((( typhoid never ) OR ( lymphoid never )))).
• Adding a wildcard symbol may retrieve word variants: (((("typhoid fever") OR ("typhoid ever"))) OR ((("typhoid never") OR ("lymphoid never"))))*.