Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van hau doan snippets" » "van chan doan snippets", "van thai doan snippets", "van tap doan snippets", "van ha doan snippets", "van hai doan snippets", "van dau doan snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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 hau doan 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 hau doan snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( van hau doan snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("van hau doan snippets"))) or ("locating bug code snippets"))*.