英和和英

So that it won't be found

have no luck

Can't find it

not able to be found

I have looked for them in vain

I can not find them.

Can't find it

We do not know where to look

We have no clue to guide us.

I do not know where to look

I have no clue to guide me.

an aimless search

Couldn't find it

impossible to find

I have looked for it, but in vain.

（男）a slippery fellow―（考え）―a subtle idea―（言）―a vague statement―（返事）―an evasive answer―an elusive reply

I will not leave it unsearched for

I will be sure to search for it.

(of things) to disappear

an aimless search

I see no good in him

I see nothing in him.

to be harmless and inoffensive―indifferent―neutral―non-committal

not discovered

unable to find your way

He lacks decision―never knows his own mind―He is indecisive―irresolute.

The difficulty is not to be overcome

There is no way out of the difficulty

It is no use

It is no good