Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tang van can snippets" » "dang van can snippets", "hoang van can snippets", "trong van can snippets", "tang van canh snippets", "tang van ban snippets", "tang ban can 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: (((("tang van can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tang van can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tang van can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tang van can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.