Perhaps you should try some spelling variations:
"het internationaal seminar prize" » "het international seminar prize" (Expand Search), "het internationaal seminarie prize" (Expand Search), "het internationaal verdrag prize" (Expand Search), "_ international seminar prize" (Expand Search), "de internationale seminar prize" (Expand Search)
"_ internationale de prize" » "_ internationale des prize" (Expand Search), "_ international de prize" (Expand Search), "de internationale de prize" (Expand Search), "en internationale de prize" (Expand Search), "_ internationale de prijzen" (Expand Search), "_ internationale de prince" (Expand Search), "_ internationale de prijs" (Expand Search)

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: "((\"het internationaal seminar prize\") OR (\"_ internationale de prize\"))~".
• Removing quotes may allow a broader search: (( het internationaal seminar prize ) OR ( _ internationale de prize ))~.
• Adding a wildcard symbol may retrieve word variants: (("het internationaal seminar prize") OR ("_ internationale de prize"))*.