Perhaps you should try some spelling variations:
"chung thong luan van. hoc dung uoc mo" » "thong thong luan van. hoc dung uoc mo", "hung thang luan van. hoc dung uoc mo", "cong thong luan van. hoc dung uoc mo", "chung thong quan van. hoc dung uoc mo", "chung tong luan van. hoc dung uoc mo", "chung thong xuan van. hoc dung uoc mo", "chung thong luan van. hoc ung uoc mo", "chung thong luan van. hoc dan uoc mo", "chung thong luan van. tac dung uoc mo", "chung thong luan van. hoc dung quoc mo", "chung thong luan van. hoc dung hoc mo", "chung thong luan van. hoc dung coc mo"
"nhung loi quyet van. noi dung nguon mo" » "nhung loi quyet van. noi dung nguoi mo", "nhung loi quyet van. noi luong nguon mo", "nhung loi quyet van. noi dung ngan mo", "nhung bai quyet van. noi dung nguon mo", "nhung bi quyet van. noi dung nguon mo", "nhung gi quyet van. noi dung nguon mo", "nhung toi quyet van. noi dung nguon mo", "nhung loi que van. noi dung nguon mo", "nhung loi quyet van. noi dung nguoi moi", "nhung loi quyet van. noi dung nguon goc"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("chung thong luan van. hoc dung uoc mo") or ("nhung loi quyet van. noi dung nguon mo"))~.
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• Adding a wildcard symbol may retrieve word variants: (("chung thong luan van. hoc dung uoc mo") or ("nhung loi quyet van. noi dung nguon mo"))*.