Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phap moi du snippets" » "phap mo du snippets", "phap boi du snippets", "pham moi du snippets", "phap moi de snippets", "phap moi tu snippets", "phap toi du 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: (((("phap moi 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: (((("phap moi du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phap moi du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phap moi du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.