Perhaps you should try some spelling variations:
"nhung thi ho van. nguoi dung ho mo" » "nhung thi ho van. nguoi nung ho mo", "nhung thi ho van. nguoi muong ho mo", "nhung thi ho van. nguoi dan ho mo", "nhung thoi ho van. nguoi dung ho mo", "phung thi ho van. nguoi dung ho mo", "nhung tri ho van. nguoi dung ho mo", "nhung thi ho van. nguoi dung cho mo", "nhung thi ho van. nguoi dung he mo", "nhung thi ho van. nguoi dung co mo", "nhung thi hao van. nguoi dung ho mo", "nhung thi hoa van. nguoi dung ho mo", "nhung thi tho van. nguoi dung ho mo", "nhung thi hoc van. nguoi dung ho mo", "nhung thi vo van. nguoi dung ho mo", "nhung thi so van. nguoi dung ho mo", "nhung thi ho van. nguoi dung ho mon", "nhung thi ho van. nguoi dung hoc mo", "nhung thi ho van. nguoi dung ho so"
"nhung gi quyet van. noi dung hoc mot" » "nhung bi quyet van. noi dung hoc mot", "nhung bai quyet van. noi dung hoc mot", "nhung giai quyet van. noi dung hoc mot", "nhung gia quyen van. noi dung hoc mot", "nhung gi quyet van. hoc dung hoc mot", "nhung gi quyet van. noi dong hoc mot", "nhung gi quyet van. noi dung thuoc mot", "nhung gi quyet van. noi trung hoc mot", "nhung gi quyet van. noi dung choc mot", "nhung gi quyet van. noi dung hec mot", "nhung gi quyet van. noi dung coc mot", "nhung gi quyet van. noi dung hoc moi"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung thi ho van. nguoi dung ho mo") or ("nhung gi quyet van. noi dung hoc mot"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nhung thi ho van. nguoi dung ho mo") OR ("nhung gi quyet van. noi dung hoc mot")).
• Removing quotes may allow a broader search: (( nhung thi ho van. nguoi dung ho mo ) or ( nhung gi quyet van. noi dung hoc mot )).
• Adding a wildcard symbol may retrieve word variants: (("nhung thi ho van. nguoi dung ho mo") or ("nhung gi quyet van. noi dung hoc mot"))*.