Perhaps you should try some spelling variations:
"van ngoc hang slippery" » "van ngoc thang slippery", "van ngoc hoang slippery", "van ngoc hung slippery", "tran ngoc hang slippery", "van hoc hang slippery", "van nghe hang slippery", "van ngoc hang 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: (((("python using a snippets") or ("van ngoc hang slippery"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using a snippets") OR ("van ngoc hang slippery"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( python using a snippets ) or ( van ngoc hang slippery ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using a snippets") or ("van ngoc hang slippery"))) or ("locating bug code snippets"))*.