Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"van than du snippets" » "van than code snippets", "van thanh du snippets", "van thang du snippets", "van tuan du snippets", "van than duc snippets", "van toan du snippets", "van han du snippets"
"python using java snippets" » "python using data 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 than du snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van than du snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( van than du snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van than du snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.