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