Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc hieu he snippets" » "doc hieu he snippets", "duc hien he snippets", "thuc hieu he snippets", "duc hieu ve snippets", "duc hiem he snippets", "duc hieu le 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: (((("duc hieu he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duc hieu he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc hieu he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc hieu he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.