Some common errors:

• You must use hyphens for a CAS number. For an NSN you can use hyphens or just enter all the digits together in one long string. For product and compny names, if you're not absolutely sure hyphens are needed, leave blanks instead.
• Sorry, but the index can't interpret chemical formulas like H2SO4. Use Sulfuric Acid.
• Leave out isomer numbers in a chemical name, i.e. butane-1,3-diol should be butane diol.
• You don't need to enter the word msds or the word CAS if you're looking for a cas number, just enter the number with hyphens in the right places.
• Loctite Permatex
  or Wyeth Lederle
  -Doesn't work because these are two different brand names, and the MSDS will have only one or the other, even if they are owned by the same company.
• if you're not sure if the word should be split, split it
• An MSDS just does not provide useful information on drugs. You need the package insert, usually available at any pharmacy.
• It's odd, but that's how they spell it dept:
  • RUSTOLEUM should be RUST-OLEUM
  • WD40 should be WD-40
  • White-Out should be Wite-Out
  • Sulpher should be sulfur (at least in the US)
  • TESTORS should be TESTOR or TESTOR'S
  • DENATEUR should probably be denatured
  • BRAKEKLEEN should be BRAKLEEN
  • HYDRAULIC FLUID MIL-PRF-83282D could be found by just entering 83282D. Similarly, for MIL-I-21164 just enter 21164. Hyphenated terms tend to be entered in various ways.
  • LOCKTITE should be LOCTITE
  • Caterpiller should be Caterpillar
  • Butyl 0,0 Diethyl should be butyl diethyl
  • SAE 10-40 should be just 10W 40 (This will get 10W-40 and 10W40)
  • Flouro should be Fluoro
  • Liquid Wrench Oil should be just Liquid Wrench, "Oil" is not in the product name.
  • Phenylmethylsiloxane - try phenyl methyl siloxane. This will pick up phenylmethylpolysiloxane, which is how it's actually listed. It's very difficult to know exactly how a chemical name will be entered, but all the strings you enter will be present somewhere in the title of any MSDS returned by the search.
• Try to enter just one unique string from the company name and one from the product name. Everything you enter has to be somewhere in the MSDS title. "Anerobic Adhesive 242 Loctite Corporation" doesn't work, but it could be found by just entering "Loctite 242". It would be even better to click on the letter "L" above and select the link to the official Loctite MSDS index page.