Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van phong di snippets" » "van dong di snippets", "hai phong di snippets", "van phong dieu snippets", "van phong dien snippets", "van phong dinh 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: (((("van phong di snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van phong di snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van phong di snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van phong di snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.