Perhaps you should try some spelling variations:
estimate international » estimating international, climate international, estimate interregional
international travel » international trade
interaction terms » interaction term
support estimate » support climate, support state, supports climate
tax interaction » a interaction, face interaction, 3the interaction
support tax » support team, support a, support can

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( support tax interaction terms. ) or ( support estimate international travel. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( support tax interaction terms. ) OR ( support estimate international travel. )).
• Adding a wildcard symbol may retrieve word variants: (( support tax interaction terms. ) or ( support estimate international travel. ))*.