Perhaps you should try some spelling variations:
"preparation from traffic" » "preparation _ traffic", "preparation a traffic", "preparation from paraffin", "preparation from graffiti", "preparation term traffic"
"preparation from trade" » "preparation _ trade", "preparation a trade"
"repartition de travail" » "repartition des travail", "repartition du travail", "repartition et travail"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("preparation from traffic") or ("preparation from trade"))) or ("repartition de travail"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("preparation from traffic") OR ("preparation from trade"))) OR ("repartition de travail"))*.
• Removing quotes may allow a broader search: (((( preparation from traffic ) or ( preparation from trade ))) or ( repartition de travail ))*.