Perhaps you should try some spelling variations:
"levant supplementary services" » "levant supplementary exercises", "level supplementary services", "cleaner supplementary services", "present supplementary services"
"eleven supplementary services" » "eleven supplementary exercises", "level supplementary services", "selected supplementary services", "present supplementary services"
"levant supplementary studies" » "levant complementary studies", "levant supplementary study", "levant supplementary standard", "level supplementary studies", "cleaner supplementary studies", "present supplementary studies"

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 studies") OR ((("levant supplementary services") OR ("eleven supplementary services")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"levant supplementary studies\") or (((\"levant supplementary services\") OR (\"eleven supplementary services\"))))".
• Removing quotes may allow a broader search: (( levant supplementary studies ) or ((( levant supplementary services ) OR ( eleven supplementary services )))).
• Adding a wildcard symbol may retrieve word variants: (("levant supplementary studies") or ((("levant supplementary services") OR ("eleven supplementary services"))))*.