Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"len ngoc du snippets" » "le ngoc du snippets", "len ngoi du snippets", "lang ngoc du snippets", "len ngoc duc snippets", "len ngoc de snippets", "len ngoc tu 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: (((("len ngoc 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: (((("len ngoc du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( len ngoc du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("len ngoc du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.