Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dam tra du snippets" » "dam trao du snippets", "dan tra du snippets", "nam tra du snippets", "dam tra tu snippets", "dam tran duc snippets", "dam tran duy 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: (((("dam tra du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dam tra du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dam tra du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dam tra du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.