• 言(speech; words)
• 賣(sell; vend)

Reading a book is using spoken words to 'sell out' knowledge to the listener.

• 囗(surround; fence)
• 木(tree; wood)

A tree surrounded and trapped on all four sides with no way to escape represents hardship.

• 又(hand; again)
• 隹(short-tailed bird)

Catching a short-tailed bird in flight with bare hands is as difficult as the challenge this character represents.

• 言(speech; words)
• 賣(sell; vend)

Reading a book is using spoken words to 'sell out' knowledge to the listener.

• 囗(surround; fence)
• 木(tree; wood)

A tree surrounded and trapped on all four sides with no way to escape represents hardship.

• 又(hand; again)
• 隹(short-tailed bird)

Catching a short-tailed bird in flight with bare hands is as difficult as the challenge this character represents.