Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van duoc do snippets" » "van duc do snippets", "vat duoc do snippets", "tan duoc do snippets", "van duoc dao snippets", "van duoc co snippets", "van duoc vo 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 duoc 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 duoc do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van duoc do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van duoc do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.