Perhaps you should try some spelling variations:
"tank liquid chromatography" » "tandem liquid chromatography", "black liquid chromatography"
"think gas chromatography" » "thin gas chromatography", "think fast chromatography", "think case chromatography"

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

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