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