Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van hoang cd snippets" » "van hoan cd snippets", "quan hoang cd snippets", "tran hoang cd snippets", "van hoang cao snippets", "van hoang chi snippets", "van hoang _ 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 hoang cd 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 hoang cd snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van hoang cd snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van hoang cd snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.