To manage (to succeed)
réussir (à) / parvenir (à)
To handle (to deal with)
gérer / se débrouiller
To achieve
atteindre (un but)
To gather
rassembler
To provide
fournir
To seek
chercher
To lack
manquer (de)
To improve
améliorer
To consider
considérer
To require
exiger / requérir