veil, vale, avail

Veil or veil means a piece of cloth that covers the face or part of the face--
An American bride often wears a white veil.
It is still the custom in some countries for a woman to wear a veil in public.

Vale or vale ( rhymes with veil )  is an old-fashioned word for "valley", meaning a depression in the landscape, as between two hills--
The sunset filled the vale with golden light.
Some people believe that life is meant to be a vale of tears.

Avail or avail ( one word, rhymes with a veil ) means usefulness, advantage or profit, usually of an action--
He tried every suggestion in the instruction manual, but to no avail.
To "avail oneself"  means to take advantage of an opportunity, or to help oneself  to something--
Since he had to go to California on business, they decided to avail themselves of the chance to visit the Pacific.

 Now that you know that, you can say--
"They searched all over the vale for the veil the bride had lost, but to no avail."

Note--"vale" ( pronounced voll-ay ) is a Latin word, meaning farewell--
Ave atque vale means hail and farewell, or greetings and good-bye.
Note # 2--you may see "vail" in an older book, meaning to be of use or profit.
"Vail" may also mean a tip or gratuity, or to lower something, including one's hat to the gentry.