Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hieu mot co snippets" » "thieu mot co snippets", "hieu moi co snippets", "hieu so co snippets", "hieu mot so snippets", "hieu mot cong 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: (((("hieu mot co snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hieu mot co snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hieu mot co snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hieu mot co snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.