Perhaps you should try some spelling variations:
"levant supplementary services" » "levant supplementary exercises", "level supplementary services", "cleaner supplementary services", "present supplementary services"
"eleven supplementary queries" » "eleven supplementary exercises", "eleven supplementary studies", "eleven supplementary material", "level supplementary queries", "selected supplementary queries", "cleaner supplementary queries"
"eleven supplementary materials" » "level supplementary materials", "selected supplementary materials", "cleaner supplementary materials"

Try widening your search to All Fields.

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("levant supplementary services") OR ((("eleven supplementary queries") OR ("eleven supplementary materials")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"levant supplementary services\") or (((\"eleven supplementary queries\") OR (\"eleven supplementary materials\"))))".
• Removing quotes may allow a broader search: (( levant supplementary services ) or ((( eleven supplementary queries ) OR ( eleven supplementary materials )))).
• Adding a wildcard symbol may retrieve word variants: (("levant supplementary services") or ((("eleven supplementary queries") OR ("eleven supplementary materials"))))*.