Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khat van du snippets" » "hat van du snippets", "chat van du snippets", "khao van du snippets", "khat van duy snippets", "khat van dau snippets", "khat 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: (((("khat 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: (((("khat van du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khat van du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khat van du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.