Perhaps you should try some spelling variations:
"chung thi quyet van. noi dung quoc mo" » "phung thi quyet van. noi dung quoc mo", "chung chi quyet van. noi dung quoc mo", "nhung 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 dong quoc mo", "chung thi quyet van. noi trung quoc mo", "chung thi quyet van. noi dung thuoc 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"
"chung thi quyet van. noi dang quoc mo" » "phung thi quyet van. noi dang quoc mo", "chung chi quyet van. noi dang quoc mo", "nhung thi quyet van. noi dang quoc mo", "chung thi tuyet van. noi dang quoc mo", "chung toi quyet van. noi dang quoc mo", "chung theo quyet van. noi dang quoc mo", "chung thi quyet van. noi dang thuoc mo", "chung thi quyet van. noi han quoc mo", "chung thi quyet van. hoi dang quoc mo", "chung thi quyet van. moi dang quoc mo", "chung thi quyet van. noi bang quoc mo", "chung thi quyet van. noi dang uoc mo", "chung thi quyet van. noi dang quoc co", "chung thi quyet van. noi dang 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 ("chung thi quyet van. noi dang quoc mo"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"chung thi quyet van. noi dung quoc mo\") OR (\"chung thi quyet van. noi dang quoc mo\"))".
• Removing quotes may allow a broader search: (( chung thi quyet van. noi dung quoc mo ) OR ( chung thi quyet van. noi dang quoc mo )).
• Adding a wildcard symbol may retrieve word variants: (("chung thi quyet van. noi dung quoc mo") OR ("chung thi quyet van. noi dang quoc mo"))*.