Perhaps you should try some spelling variations:
"nhung nguoi quan ha. moi quan cua lam" » "nhung nguyen quan ha. moi quan cua lam", "nhung nguoi san ha. moi quan cua lam", "nhung nguoi dan ha. moi quan cua lam", "nhung nguoi quan ha. mai quan cua lam", "nhung nguoi quan ha. hai quan cua lam", "nhung nguoi quan ha. co quan cua lam", "nhung nguoi quan ha. moi quan luan lam", "nhung nguoi quan ha. moi ban cua lam", "nhung nguoi quan ha. moi gian cua lam", "nhung nguoi quan he. moi quan cua lam", "nhung nguoi quan ha. moi quan cua tam", "nhung nguoi quan ha. moi quan cua nam", "nhung nguoi quan ha. moi quan cua am"
"nhung cho cua van. cho tuan thu lap" » "chung cho cua van. cho tuan thu lap", "nhung chi cua van. cho tuan thu lap", "nhung chu cua van. cho tuan thu lap", "nhung cho cua van. chu tuan thu lap", "nhung cho cua van. cho thanh thu lap", "nhung cho cua van. cho tuong thu lap", "nhung cho cua van. cho toan thuc lap", "nhung cho cua van. cho van thu lap", "nhung co cua van. cho tuan thu lap", "nhung cho ca van. cho tuan thu lap", "nhung cho cua ban. cho tuan thu lap", "nhung cho cua vat. cho tuan thu lap", "nhung cho cua dan. cho tuan thu lap", "nhung cho cua van. cho tuan thu lao", "nhung cho cua van. cho tuan tu lap", "nhung cho cua van. cho tuan thuat lap"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung nguoi quan ha. moi quan cua lam") or ("nhung cho cua van. cho tuan thu lap"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nhung nguoi quan ha. moi quan cua lam") OR ("nhung cho cua van. cho tuan thu lap")).
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• Adding a wildcard symbol may retrieve word variants: (("nhung nguoi quan ha. moi quan cua lam") or ("nhung cho cua van. cho tuan thu lap"))*.