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