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