Perhaps you should try some spelling variations:
"minh de chinh triet hoc mac-lenin" » "minh de chinh tri hoc mac-lenin", "minh de trinh triet hoc mac-lenin", "minh de chinh tien hoc mac-lenin", "minh den chinh triet hoc mac-lenin", "minh te chinh triet hoc mac-lenin", "minh do chinh triet hoc mac-lenin", "menh de chinh triet hoc mac-lenin", "minh ve chinh triet hoc mac-lenin", "sinh de chinh triet hoc mac-lenin", "minh de chinh triet hoc ma-lenin", "minh de chinh triet hoc cac-lenin"
"minh de chinh triet hoc may-lenin" » "minh de chinh tri hoc may-lenin", "minh de trinh triet hoc may-lenin", "minh de chinh tien hoc may-lenin", "minh den chinh triet hoc may-lenin", "minh te chinh triet hoc may-lenin", "minh do chinh triet hoc may-lenin", "menh de chinh triet hoc may-lenin", "minh ve chinh triet hoc may-lenin", "sinh de chinh triet hoc may-lenin", "minh de chinh triet hoc ma-lenin"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("minh de chinh triet hoc mac-lenin") OR ("minh de chinh triet hoc may-lenin"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"minh de chinh triet hoc mac-lenin\") OR (\"minh de chinh triet hoc may-lenin\"))".
• Removing quotes may allow a broader search: (( minh de chinh triet hoc mac-lenin ) OR ( minh de chinh triet hoc may-lenin )).
• Adding a wildcard symbol may retrieve word variants: (("minh de chinh triet hoc mac-lenin") OR ("minh de chinh triet hoc may-lenin"))*.