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 dang quoc mo", "chung thi quyet van. noi dong quoc mo", "chung thi quyet van. noi trung 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. hoc dung quoc mo" » "phung thi quyet van. hoc dung quoc mo", "chung chi quyet van. hoc dung quoc mo", "nhung thi quyet van. hoc dung quoc mo", "chung thi tuyet van. hoc dung quoc mo", "chung toi quyet van. hoc dung quoc mo", "chung theo quyet van. hoc dung quoc mo", "chung thi quyet van. hoc dang quoc mo", "chung thi quyet van. hoc dong quoc mo", "chung thi quyet van. hoc trung quoc mo", "chung thi quyet van. hoc ung quoc mo", "chung thi quyet van. hoc dan quoc mo", "chung thi quyet van. tac dung quoc mo", "chung thi quyet van. hoc dung uoc mo", "chung thi quyet van. hoc dung quoc co", "chung thi quyet van. hoc 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 ("chung thi quyet van. hoc dung quoc mo"))~.
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• Adding a wildcard symbol may retrieve word variants: (("chung thi quyet van. noi dung quoc mo") OR ("chung thi quyet van. hoc dung quoc mo"))*.