Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van thang co snippets" » "van thanh co snippets", "van khang co snippets", "van hang co snippets", "van thong co snippets", "van tang co snippets", "van thang o 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 thang co 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 thang co snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van thang co snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van thang co snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.