Perhaps you should try some spelling variations:
"locating bugs code snippets" » "locating bug code snippets"
"python using pre snippets" » "python nursing pre snippets", "python using one snippets", "python using ph snippets"
"van thi java snippets" » "van think java snippets", "van tai java snippets", "dan thi java snippets", "van thu java 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: (((("python using pre snippets") or ("van thi java snippets"))) or ("locating bugs code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using pre snippets") OR ("van thi java snippets"))) OR ("locating bugs code snippets")).
• Removing quotes may allow a broader search: (((( python using pre snippets ) or ( van thi java snippets ))) or ( locating bugs code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using pre snippets") or ("van thi java snippets"))) or ("locating bugs code snippets"))*.