Perhaps you should try some spelling variations:
trinh chao » trinh chat, trinh co, trinh giao
trinh han » trinh quan
han lanh » han danh, hat lanh, thanh lanh
cac mau » cam mau, sach mau
cac cau » bac cau, ca cau, cac cam
dang va » dang van, dang vat, dung va
co hanh » co thanh, co phanh, do hanh
so viet » hoc viet
cong so » cong san, cong hoa
co dan » co ban, ca dan, cao dang
co doi » cho doi, co dot, co dai
cay co » cac co, tay co, cay cong
ca cay » cua cay, cac cay, ca cac
dao ca » dao cac, dao cao, dao cau
co anh » cao anh, do anh, ho anh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((( cong trinh ((co hanh) OR (co anh)) dao ca cay ((co doi) or (co dan)) viet nam ) or ( cong trinh han lanh dao ca cay co so viet nam ))) or ( chuong trinh chao ((dang va) or (hang va)) ((cac cau) or (cac mau)) cong so viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( cong trinh ((co hanh) OR (co anh)) dao ca cay ((co doi) OR (co dan)) viet nam ) OR ( cong trinh han lanh dao ca cay co so viet nam ))) OR ( chuong trinh chao ((dang va) OR (hang va)) ((cac cau) OR (cac mau)) cong so viet nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( cong trinh ((co hanh) OR (co anh)) dao ca cay ((co doi) or (co dan)) viet nam ) or ( cong trinh han lanh dao ca cay co so viet nam ))) or ( chuong trinh chao ((dang va) or (hang va)) ((cac cau) or (cac mau)) cong so viet nam ))".
• Adding a wildcard symbol may retrieve word variants: (((( cong trinh ((co hanh) OR (co anh)) dao ca cay ((co doi) or (co dan)) viet nam ) or ( cong trinh han lanh dao ca cay co so viet nam ))) or ( chuong trinh chao ((dang va) or (hang va)) ((cac cau) or (cac mau)) cong so viet nam ))*.