Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van thi hoe snippets" » "van tai hoe snippets", "dan thi hoe snippets", "van thu hoe snippets", "van thi hue snippets", "van thi hoa 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: (((("python using java snippets") or ("van thi hoe snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("van thi hoe snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( van thi hoe snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("van thi hoe snippets"))) or ("locating bug code snippets"))*.