Perhaps you should try some spelling variations:
"thuoc trong che snippets" » "thuc trong che snippets", "hoc trong che snippets", "thuat trong che snippets", "thuoc trong cho snippets", "thuoc trong chien snippets", "thuoc trong cham snippets"
"using a code snippets" » "using a core snippets"
"locating bug code snippets" » "locating bug core snippets", "locating bung code snippets", "locating bugs code 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: (((("using a code snippets") or ("thuoc trong che snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using a code snippets") OR ("thuoc trong che snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using a code snippets ) or ( thuoc trong che snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using a code snippets") or ("thuoc trong che snippets"))) or ("locating bug code snippets"))*.