Perhaps you should try some spelling variations:
"locating bugs code snippets" » "locating bug code snippets", "locating bugs code slippers"
"python using java snippets" » "python using data snippets", "python using java slippers"
"van anh duc snippets" » "van thanh duc snippets", "van minh duc snippets", "tuan anh duc snippets", "van anh duc slippers"

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 anh duc snippets") or ("python using java snippets"))) or ("locating bugs code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van anh duc snippets") OR ("python using java snippets"))) OR ("locating bugs code snippets")).
• Removing quotes may allow a broader search: (((( van anh duc snippets ) or ( python using java snippets ))) or ( locating bugs code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van anh duc snippets") or ("python using java snippets"))) or ("locating bugs code snippets"))*.