Perhaps you should try some spelling variations:
investment models » investment model, investment codes, investment levels
investment demand » investor demand
safer investment » safer investments, safe investment, after investment
trade investment » private investment, estate investment, trade adjustment
likert trade » likert scale, latent trade
kent safer » kent baker

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( h. kent safer investment models ) or ( h. likert trade investment demand ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. kent safer investment models ) OR ( h. likert trade investment demand ))*.