Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den phat cua snippets" » "de phat cua snippets", "dang phat cua snippets", "dien phan cua snippets", "den nhat cua snippets", "den chat cua snippets", "den hai cua 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 phat cua 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 phat cua snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den phat cua snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den phat cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.