Perhaps you should try some spelling variations:
"think liquid chromatography" » "thin liquid chromatography", "tank liquid chromatography", "third liquid chromatography"
"think layer chromatography" » "thin layer chromatography", "thick layer chromatography", "think later chromatography"
"think gas chromatography" » "thin gas chromatography", "think fast chromatography", "think case chromatography"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("think layer chromatography") OR ("think gas chromatography"))) OR ("think liquid chromatography")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"think layer chromatography\") OR (\"think gas chromatography\"))) or (\"think liquid chromatography\"))".
• Removing quotes may allow a broader search: (((( think layer chromatography ) OR ( think gas chromatography ))) or ( think liquid chromatography )).
• Adding a wildcard symbol may retrieve word variants: (((("think layer chromatography") OR ("think gas chromatography"))) or ("think liquid chromatography"))*.