Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa tap du snippets" » "khoa tai du snippets", "khoa than du snippets", "hoc tap du snippets", "khoa thap du snippets", "khoa lap du snippets", "khoa tap 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: (((("khoa tap 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: (((("khoa tap du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa tap du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa tap du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.