Perhaps you should try some spelling variations:
"van ngan hanh slippery" » "van ngan thanh slippery", "van ngan hang slippery", "van ngan danh slippery", "van nhan hanh slippery", "von ngan hanh slippery", "van nga hanh slippery", "van ngan hanh 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 ngan hanh 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 ngan hanh slippery"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( python using a snippets ) or ( van ngan hanh slippery ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using a snippets") or ("van ngan hanh slippery"))) or ("locating bug code snippets"))*.