Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van cao hoat snippets" » "van co hoat snippets", "van cao chat snippets", "van dan hoat snippets", "van dao hoat snippets", "van bao hoat snippets", "van cau hoat 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 cao hoat 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 cao hoat snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van cao hoat snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van cao hoat snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.