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

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: "((\"Levant supplementary studies\") OR (\"levant supplementary services\"))".
• Removing quotes may allow a broader search: (( Levant supplementary studies ) OR ( levant supplementary services )).
• Adding a wildcard symbol may retrieve word variants: (("Levant supplementary studies") OR ("levant supplementary services"))*.