Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"do trien du snippets" » "do tren du snippets", "do tien du snippets", "va trien du snippets", "do trien cua snippets", "do trien quy snippets", "do truyen 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: (((("do trien 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: (((("do trien du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( do trien du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("do trien du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.