Perhaps you should try some spelling variations:
"o nguoi cong snippets" » "o nguoi muong snippets", "o nguoi thong snippets", "o nguoi nung snippets", "_ nguoi cong snippets", "cho nguoi cong snippets", "con nguoi cong snippets"
"python using java snippets" » "python using data 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: (((("o nguoi cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("o nguoi cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( o nguoi cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("o nguoi cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.