Perhaps you should try some spelling variations:
"trong viec dat snippets" » "cong viec dat snippets", "trong dieu dat snippets", "trong hiep dat snippets", "trong vien dai snippets", "trong vien da snippets", "trong viec va snippets", "trong viec dat slippers"
"python using a snippets" » "python using a slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("trong viec dat snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trong viec dat snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trong viec dat snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trong viec dat snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.