Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"vu hoan de snippets" » "vu hoang de snippets", "su hoan de snippets", "thu hoan de snippets", "vu toan de snippets", "vu hoang le 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: (((("vu hoan de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("vu hoan de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vu hoan de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vu hoan de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.