Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java slippers" » "python using data slippers", "python using java slippery", "python using java grippers"
"duc hoc dan snippets" » "duoc hoc dan snippets", "luc hoc dan snippets", "du hoc dan snippets"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("duc hoc dan snippets") OR ("python using java slippers"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"duc hoc dan snippets\") OR (\"python using java slippers\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( duc hoc dan snippets ) OR ( python using java slippers ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc hoc dan snippets") OR ("python using java slippers"))) OR ("locating bug core snippets"))*.