So that / in order to (以便 / 以求)

Structure Action，以便 / 以求 + purpose

以便 (yǐbiàn) and 以求 (yǐqiú) open a PURPOSE clause placed after the main action: 请留下电话，以便联系 = "please leave your phone number so that we can reach you". 以便 aims at FACILITATING something (making it convenient or possible), whereas 以求 conveys that an end is SOUGHT or pursued: 不断努力，以求成功 = "to strive ceaselessly in order to succeed". Both are written, formal register. The HSK 5 relative is 以免 / 免得 (hsk5-miande), which instead introduces a NEGATIVE purpose ("so as to avoid…").

Examples

请qǐng您nín留liú下xià电diàn话huà号hào码mǎ，以yǐ便biàn我wǒ们men及jí时shí联lián系xì。
Please leave your phone number so that we can reach you promptly.
材cái料liào请qǐng提tí前qián准zhǔn备bèi好hǎo，以yǐ便biàn会huì议yì顺shùn利lì进jìn行xíng。
Please prepare the materials in advance so that the meeting can run smoothly.
他tā们men日rì夜yè钻zuān研yán，以yǐ求qiú攻gōng克kè这zhè道dào难nán题tí。
They study day and night in order to crack this difficult problem.
公gōng司sī不bù惜xī重zhòng金jīn引yǐn进jìn人rén才cái，以yǐ求qiú长cháng远yuǎn发fā展zhǎn。
The company spares no expense to recruit talent in order to achieve long-term growth.

Levels are indicative: they follow the standard Chinese Grammar Wiki (AllSet Learning) progression, not an official HSK 3.0 mapping. We never assign levels by eye.

This point and the other 370, with audio on every example, inside Wanyu.