Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ton van du snippets" » "tong van du snippets", "toan van du snippets", "tan van du snippets", "ton van duy snippets", "ton van dau snippets", "ton van de snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("ton van du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ton van du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ton van du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ton van du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.