Perhaps you should try some spelling variations:
"think liquid chromatography" » "thin liquid chromatography", "tank liquid chromatography", "within liquid chromatography"
"third liquid chromatography" » "thin liquid chromatography", "hire liquid chromatography", "chiral liquid chromatography"
"thick layer chromatography" » "thick layers chromatography", "thick bilayer chromatography", "thin layer 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: (((("thick layer chromatography") OR ("think gas chromatography"))) OR ((("think liquid chromatography") OR ("third liquid chromatography")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"thick layer chromatography\") or (\"think gas chromatography\"))) or (((\"think liquid chromatography\") OR (\"third liquid chromatography\"))))".
• Removing quotes may allow a broader search: (((( thick layer chromatography ) or ( think gas chromatography ))) or ((( think liquid chromatography ) OR ( third liquid chromatography )))).
• Adding a wildcard symbol may retrieve word variants: (((("thick layer chromatography") or ("think gas chromatography"))) or ((("think liquid chromatography") OR ("third liquid chromatography"))))*.