费尽心思 spare no effort
Explanation
指用尽心思，想尽办法。
means to use all one's ingenuity and try every means.
Origin Story
话说唐朝时期，有个书生叫李白，他从小就聪明好学，尤其擅长诗词歌赋。有一天，他听说长安城内举办了一场盛大的诗会，众多才华横溢的诗人都会参加。李白心生向往，渴望在诗会上展示自己的才华，于是便决定前往长安。为了这次诗会，李白费尽心思准备，他翻阅了大量的书籍，汲取了丰富的知识，反复推敲诗句，力求做到完美。他甚至常常挑灯夜战，废寝忘食，一心只想着创作出惊艳四座的诗篇。终于，诗会来临了。李白怀揣着精心准备的诗作，自信满满地走上了舞台。他朗诵的诗歌，充满了激情和才华，赢得了在场所有人的赞赏和喝彩。李白凭借着他的才华和努力，最终在诗会上脱颖而出，名扬天下。从此以后，李白就成为了一代诗仙，他的诗歌流传至今，被人们传颂至今。
It is said that during the Tang Dynasty, there was a scholar named Li Bai, who was intelligent and studious from a young age, and particularly excelled in poetry and song. One day, he heard that a grand poetry festival was being held in Chang'an, and many talented poets would be attending. Li Bai yearned to participate and hoped to showcase his talent at the festival, so he decided to go to Chang'an. For this poetry festival, Li Bai painstakingly prepared. He read a large number of books, absorbed a wealth of knowledge, and repeatedly polished his verses, striving for perfection. He often worked late into the night, neglecting sleep and food, focusing solely on creating poems that would amaze everyone. Finally, the poetry festival arrived. Li Bai, with his carefully prepared works, confidently took to the stage. The poems he recited were filled with passion and talent, earning the praise and applause of everyone present. Li Bai, with his talent and hard work, ultimately stood out at the festival and became famous throughout the land. From then on, Li Bai became a legendary poet, his poems passed down to this day and sung by people.
Usage
表示为了达到某种目的，想尽一切办法，不遗余力。
indicates that one makes every effort to achieve a goal.
Examples
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为了这次演出，他们费尽心思准备了很久。
wèile zhè cì yǎnchū, tāmen fèijìn xīnsī zhǔnbèi le hěn jiǔ.
They spent a lot of effort preparing for this performance.
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他费尽心思才说服了他的父母。
tā fèijìn xīnsī cái shuōfú le tā de fùmǔ.
He tried hard to convince his parents.
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她费尽心思为他挑选生日礼物。
tā fèijìn xīnsī wèi tā tiāoxuǎn shēngri lǐwù
She painstakingly chose a birthday gift for him.