The searches are fairly self-evident. You may search for one or two keywords. In the latter case, you may have the logical functions AND, OR or AND NOT between the two.
For special letters or combinations of letters, use the symbols '?' (one free character) or '*' (free string). Examples using the AUTHOR field: M?ller (59 hits) (Muller, M{\"u}ller, Miller, M{\o}ller,.. but not Mueller) M*ller (93 hits) (those above, plus Mueller) M*ller AND NOT Miller (73 hits, best alternative).
You may search for isolated words but not for strings. To look for Y-F Zhao, eliminating other Zhao:s, use AUTHOR Zhao AND AUTHOR Y-F (12 hits).
A search for ANY gold will give papers on gold or its compounds and papers in Gold Bulletin (116 hits). A search for TITLE gold* finds 118 hits on gold or its compounds.
An efficient way to search for data on a given element, such as gold, is to combine a case-specific (so far two-letter) chemical symbol and a name: [case specific] TITLE Au OR TITLE gold.
The answers are given in the BibTex format.