Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den ngan can snippets" » "dan ngan can snippets", "den ngay can snippets", "ten ngan can snippets", "den ngan han snippets", "den ngan van snippets", "den ngan lan 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: (((("den ngan can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("den ngan can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den ngan can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den ngan can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.