Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc van code snippets" » "duc van de snippets", "duc van hoe snippets", "duc van cong snippets", "duc va code snippets", "duc tan code snippets", "duc manh code snippets"
"locating bug core snippets" » "locating bug code snippets"

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

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