Perhaps you should try some spelling variations:
"cong trinh cao lan va cac tay co so viet nam" » "cong trinh chao lan va cac tay co so viet nam", "cong trinh co lan va cac tay co so viet nam", "cong trinh cau lan va cac tay co so viet nam", "cong trinh cao dang va cac tay co so viet nam", "cong trinh cao tang va cac tay co so viet nam", "cong trinh cao bang va cac tay co so viet nam", "cong trinh cao lan va cac cay co so viet nam", "cong trinh cao lan va cac tac co so viet nam", "cong trinh cao lan va cac tai co so viet nam", "cong trinh cao lan va cac tay co hoc viet nam", "cong trinh cao luan va cac tay co so viet nam", "cong trinh cao lanh va cac tay co so viet nam", "cong trinh cao lan van cac tay co so viet nam", "cong trinh cao lan va cac ty co so viet nam", "cong trinh cao lan va cac tay o so viet nam"
"cong trinh cao van va cac tay co so viet nam" » "cong trinh chao van va cac tay co so viet nam", "cong trinh co van va cac tay co so viet nam", "cong trinh cau van va cac tay co so viet nam", "cong trinh cao van va cac cay co so viet nam", "cong trinh cao van va cac tac co so viet nam", "cong trinh cao van va cac tai co so viet nam", "cong trinh cao van va cac tay co hoc viet nam", "cong trinh cac van va cac tay co so viet nam", "cong trinh dao van va cac tay co so viet nam", "cong trinh cao dang va cac tay co so viet nam", "cong trinh cao van va cac ty co so viet nam", "cong trinh cao van va cac tay o so viet nam", "cong trinh cao van vat cac tay co so viet nam", "cong trinh cao van van cac tay co so viet nam", "cong trinh cao ban va cac tay co so viet nam"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("cong trinh cao lan va cac tay co so viet nam") OR ("cong trinh cao van va cac tay co so viet nam"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cong trinh cao lan va cac tay co so viet nam\") OR (\"cong trinh cao van va cac tay co so viet nam\"))".
• Removing quotes may allow a broader search: (( cong trinh cao lan va cac tay co so viet nam ) OR ( cong trinh cao van va cac tay co so viet nam )).
• Adding a wildcard symbol may retrieve word variants: (("cong trinh cao lan va cac tay co so viet nam") OR ("cong trinh cao van va cac tay co so viet nam"))*.