Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
level development » levels development, legal development, uneven development
informatio part » information part, information mart, information pack
development use » development using, development under, development unit
systems level » system level
y optical » _ optical, 3 optical, 4 optical
part y » part i, part _, part 1

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

• Performing a fuzzy search may retrieve terms with similar spellings: technologies _ informatio part y optical communication systems level development use africa.~.
• Adding a wildcard symbol may retrieve word variants: technologies _ informatio part y optical communication systems level development use africa.*.