Perhaps you should try some spelling variations:
"chung thi nguyen quang. noi dung hoc mo" » "chung thi nguyen xuan. noi dung hoc mo", "chung thi nguyen van. noi dung hoc mo", "chung thi nguyen thanh. noi dung hoc mo", "chung thai nguyen quang. noi dung hoc mo", "chung tai nguyen quang. noi dung hoc mo", "chung thi nguyet quang. noi dung hoc mo", "phung thi nguyen quang. noi dung hoc mo", "chung chi nguyen quang. noi dung hoc mo", "nhung thi nguyen quang. noi dung hoc mo", "chung thi nguyen quang. hoc dung hoc mo", "chung thi nguyen quang. noi dong hoc mo", "chung thi nguyen quang. noi dung thuoc mo", "chung thi nguyen quang. noi trung hoc mo", "chung thi nguyen quang. noi dung hoc moi", "chung thi nguyen quang. noi dung hoc mot", "chung thi nguyen quang. noi dung hoc mon"
"nhung khi quyen vang. nuoi duong hoc moni" » "nhung khi quyen van. nuoi duong hoc moni", "nhung khi quyet van. nuoi duong hoc moni", "nhung khi huyen van. nuoi duong hoc moni", "nhung khi quyen vang. nguoi muong hoc moni", "nhung khi quyen vang. boi duong hoc moni", "nhung khi quyen vang. nguoi dung hoc moni", "nhung khai quyen vang. nuoi duong hoc moni", "nhung khia quyen vang. nuoi duong hoc moni", "nhung chi quyen vang. nuoi duong hoc moni", "nhung thi huyen vang. nuoi duong hoc moni", "nhung thi xuyen vang. nuoi duong hoc moni", "nhung thi tuyen vang. nuoi duong hoc moni", "nhung khi quyen vang. nuoi dong hoc moni", "nhung khi quyen vang. nuoi duong hoi moni", "nhung khi quyen vang. nuoi duong ho moni", "nhung khi quyen vang. nuoi duong hoc moi", "nhung khi quyen vang. nuoi duong hoc mon", "nhung khi quyen vang. nuoi duong hoc noi", "nhung khi quyen vang. nuoi duong hoc moini", "nhung khi quyen vang. nuoi duong hoc motni", "nhung khi quyen vang. nuoi duong hoc monni"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("chung thi nguyen quang. noi dung hoc mo") or ("nhung khi quyen vang. nuoi duong hoc moni"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("chung thi nguyen quang. noi dung hoc mo") OR ("nhung khi quyen vang. nuoi duong hoc moni")).
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• Adding a wildcard symbol may retrieve word variants: (("chung thi nguyen quang. noi dung hoc mo") or ("nhung khi quyen vang. nuoi duong hoc moni"))*.