1. In ninth century China, at the height of the Tang dynasty, the government became concerned about the inconvenience of carrying large amounts of coins in order to conduct business.
Explanation:

"Inconvenience" (sự bất tiện) is the correct noun form of "convenient" to indicate the problem of carrying coins.

2. ... in order to conduct business transactions.
Explanation:

"Transactions" (giao dịch) is the correct noun form of "action" related to business dealings.

3. ... which had a tendency to blow away.
Explanation:

"Tendency" (xu hướng) is the correct noun form of "tend," describing the likelihood of something happening.

4. This quickly earned them the nickname ‘flying cash’.
Explanation:

"Nickname" (biệt danh) is the correct noun derived from "name," used for informal names.

5. They were transferable, so merchants began exchanging them with each other instead of using coins.
Explanation:

"Transferable" (có thể chuyển nhượng) is the correct adjective form of "transfer," describing something that can be passed between people.

6. It was not until the Song dynasty that actual paper money was created. Initially introduced by a group of merchants and financiers...
Explanation:

"Initially" (ban đầu) is the correct adverb form of "initial," describing the time of introduction.

7. These were accompanied by various intricate markings...
Explanation:

"Accompanied" (được đi kèm) is the correct past participle form of "accompany," indicating that the markings were included.

8. ... the identification of which could be made only by issuing banks...
Explanation:

"Identification" (sự nhận dạng) is the correct noun form of "identify," referring to the process of recognizing something.

9. ... the government decided to withdraw the banknotes and issue government notes in their place.
Explanation:

"Withdraw" (rút lại) is the correct verb form of "draw," meaning to take back or remove something.

10. As a result, the use of paper money soon became widespread.
Explanation:

"Widespread" (phổ biến rộng rãi) is the correct adjective form of "spread," indicating that the use of paper money was prevalent.