Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van phan mon snippets" » "van phong mon snippets", "van thanh mon snippets", "luan phan mon snippets", "van phan bon snippets", "van phan mo snippets", "van phan moi 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 phan mon 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 phan mon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van phan mon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van phan mon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.