Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van tuyen do snippets" » "va tuyen do snippets", "van chuyen do snippets", "van nguyen do snippets", "van tuyen o snippets", "van tuyen co snippets", "van tuyen mo 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 tuyen do 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 tuyen do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van tuyen do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van tuyen do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.