Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van duc code snippets" » "van duc cong snippets", "van duc con snippets", "van bug code snippets", "van duy code snippets", "van du code snippets", "tran duc 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: (((("van duc code snippets") OR ("python using java snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"van duc code snippets\") OR (\"python using java snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( van duc code snippets ) OR ( python using java snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van duc code snippets") OR ("python using java snippets"))) OR ("locating bug core snippets"))*.