Perhaps you should try some spelling variations:
"chung thi quyet van. noi dung quoc mo" » "chung chi quyet van. noi dung quoc mo", "nhung thi quyet van. noi dung quoc mo", "phuong thi quyet van. noi dung quoc mo", "chung thi tuyet van. noi dung quoc mo", "chung toi quyet van. noi dung quoc mo", "chung theo quyet van. noi dung quoc mo", "chung thi quyet van. noi dang quoc mo", "chung thi quyet van. noi dong quoc mo", "chung thi quyet van. noi trung quoc mo", "chung thi quyet van. hoc dung quoc mo", "chung thi quyet van. noi dung uoc mo", "chung thi quyet van. noi dung quoc co", "chung thi quyet van. noi dung quoc lo"
"phung thi quyet van. noi dung quoc mo" » "phung thi tuyet van. noi dung quoc mo", "phung toi quyet van. noi dung quoc mo", "phung theo quyet van. noi dung quoc mo", "phung thi quyet van. noi dang quoc mo", "phung thi quyet van. noi dong quoc mo", "phung thi quyet van. noi trung quoc mo", "phung thi quyet van. hoc dung quoc mo", "phung thi quyet van. noi dung uoc mo", "phung thi quyet van. noi dung quoc co", "phung thi quyet van. noi dung quoc lo"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("chung thi quyet van. noi dung quoc mo") OR ("phung thi quyet van. noi dung quoc mo"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"chung thi quyet van. noi dung quoc mo\") OR (\"phung thi quyet van. noi dung quoc mo\"))".
• Removing quotes may allow a broader search: (( chung thi quyet van. noi dung quoc mo ) OR ( phung thi quyet van. noi dung quoc mo )).
• Adding a wildcard symbol may retrieve word variants: (("chung thi quyet van. noi dung quoc mo") OR ("phung thi quyet van. noi dung quoc mo"))*.