Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"son pha du snippets" » "son pham du snippets", "son ha du snippets", "san pham du snippets", "son pham duc snippets", "son pham duy snippets", "son phan duc 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: (((("son pha 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: (((("son pha du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( son pha du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("son pha du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.