Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nang du tong snippets" » "nang tu tong snippets", "nang luc tong snippets", "nang doc tong snippets", "nang du trong snippets", "nang vu tong 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: (((("nang du tong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nang du tong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nang du tong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nang du tong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.