Perhaps you should try some spelling variations:
"central de research project case." » "central de research projects case.", "central de research project based.", "central de research project cycle.", "central does research project case.", "central key research project case.", "central led research project case.", "centrale des research project case.", "central _ research project case.", "centro de research project case."
"central tax research project ii." » "central a research project ii.", "central bank research project ii.", "central _ research project ii.", "central taxes research project ii.", "central tax research project aid.", "central tax research project epi.", "central tax research project hci."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("central de research project case.") OR ("central tax research project ii."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"central de research project case.\") OR (\"central tax research project ii.\"))*".
• Removing quotes may allow a broader search: (( central de research project case. ) OR ( central tax research project ii. ))*.