Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den tinh doi snippets" » "yen tinh doi snippets", "diep tinh doi snippets", "den thanh doi snippets", "den trinh doc snippets", "den trinh do snippets", "den tinh hoc 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 tinh doi 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 tinh doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den tinh doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den tinh doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.