The asterisk character * can be used as a wildcard to match zero or more characters:

rest* will match any word starting with rest, such as restaurant or restrain
*文 will match any word ending with 文, such as 中文 or 英文
b*g will match any word starting with b and ending with g, such as big or boring
*中国* will match any word containing 中国, such as 传统中国医药 or 中国人民

Double quotes " " can be used to group search terms together:

"to rest" will only match entries where to and rest directly follow eachother

The minus symbol - can be used to find entries without a certain search term:

bill -gates will only match entries matching bill but without gates

To match only Chinese characters, Mandarin pinyin or English definition, use: c:chinese p:pinyin e:english:

p:you will only match entries with Mandarin pinyin you

'-', 'c:', 'p:' and 'e:' only influence the search term immediately after these prefixes. When used with groups, they influence the whole group they prefix.