mysql> select word, hex(word) from oldword where word = 'hua';
+--------+--------------+
| word   | hex(word)    |
+--------+--------------+
| hũa    | 6875CC8361   |
| huã    | 6875C3A3     |
| hua    | 687561       |
| hũã    | 6875CC83C3A3 |
+--------+--------------+
4 rows in set (0,04 sec)

mysql> select word, hex(word) from oldword where word like 'hua';
+-------+------------+
| word  | hex(word)  |
+-------+------------+
| huã   | 6875C3A3   |
| hua   | 687561     |
+-------+------------+
2 rows in set (0,04 sec)

mysql> select word, hex(word) from oldword where word like 'hua%';
+----------+------------------+
| word     | hex(word)        |
+----------+------------------+
| huamanal | 6875616D616E616C |
| huã      | 6875C3A3         |
| hua      | 687561           |
+----------+------------------+
3 rows in set (0,07 sec)