Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van hai he snippets" » "van ha he snippets", "van chat he snippets", "van hanh he snippets", "van tai he snippets", "van hai le snippets", "van kai he 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 hai he 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 hai he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van hai he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van hai he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.