Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"vat phan doc snippets" » "va phan doc snippets", "van phan doc snippets", "sat phan doc snippets", "vat phan duoc snippets", "vat phan duc snippets", "vat than doc 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: (((("vat phan doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("vat phan doc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vat phan doc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vat phan doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.