Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"trinh lieu voi snippets" » "trinh dieu voi snippets", "trinh lich voi snippets", "trinh dien voi snippets", "trinh lieu boi snippets", "trinh lieu va snippets", "trinh lieu hoc snippets"
"locating bug core snippets" » "locating bug code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("using java code snippets") or ("trinh lieu voi snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("trinh lieu voi snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( trinh lieu voi snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("trinh lieu voi snippets"))) or ("locating bug core snippets"))*.