Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat
giao dang » giao dan, cao dang, gian dan
trinh co » trinh do, trinh cong, trinh hoa
cac cay » ca cay, cac cam, cac cap
dao cac » do cac, sao cac, tao cac
cac cau » cac mau, bac cau, cac cam
dang va » dang van, dang vat, hang va
cong so » cong san, cong hoa
so viet » hoc viet
co lanh » co anh, co hanh, cay lanh
co doi » cho doi, co dot, co hoi
co dai » co dan, do dai
ca cau » can cau, cua cau, ca cac
cay co » cac co, tay co, cay cong

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