Perhaps you should try some spelling variations:
"think layer chromatography" » "think gas chromatography", "thick layer chromatography", "think later chromatography", "thick layers chromatography"
"thin layer chromatography" » "thin gas chromatography"
"tank liquid chromatography" » "tandem liquid chromatography", "black liquid chromatography"

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 ("thin layer chromatography"))) OR ("tank liquid chromatography")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"think layer chromatography\") OR (\"thin layer chromatography\"))) or (\"tank liquid chromatography\"))".
• Removing quotes may allow a broader search: (((( think layer chromatography ) OR ( thin layer chromatography ))) or ( tank liquid chromatography )).
• Adding a wildcard symbol may retrieve word variants: (((("think layer chromatography") OR ("thin layer chromatography"))) or ("tank liquid chromatography"))*.