Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"trac van hoe snippets" » "tran van hoe snippets", "tac van hoe snippets", "truc van hoe snippets", "trac van hoa snippets", "trac van hoc snippets", "trac van hieu 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: (((("trac van hoe snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trac van hoe snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trac van hoe snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trac van hoe snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.