unsuccessful search

this paper discusses the problem on how to calculate the frequency of unsuccessful search with equal probability in a hash table with open addressing method applied to solve collision.

讨论了在Hash查找中，用开放定址法解决冲突，在等概率查找下查找不成功的计算问题。

ivanka trump may want to double check her sources the next time she tweets, after a message about a' chinese proverb" led to a frantic-and unsuccessful-search to find its origins.

在一条关于“中国谚语”的消息引发了一场疯狂而失败的搜索以寻找它的起源后，伊万卡·特朗普可能会在下次发Twitter时再三核实她的消息来源。

His search for a move that would avoid checkmate was unsuccessful.

他没有找到一步能够避免被将死的策略.

The search has been quite unsuccessful then?

那么打捞是完全没办法了?