Perhaps you should try some spelling variations:
"o nhat chieu snippets" » "o nhat code snippets", "o nhat hieu snippets", "o nha hieu snippets", "o nhat bieu snippets", "do nhat chieu snippets", "ho nhat chieu snippets", "ro nhat chieu snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data 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 nhat chieu snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("o nhat chieu snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( o nhat chieu snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("o nhat chieu snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.