Perhaps you should try some spelling variations:
trinh cao » trinh chao, trinh co, trinh cau
giao yang » miao yang, gian lang, gia tang
trinh han » trinh quan
dai viet » mai viet, tai viet, da viet
loi viet » loai viet, hoi viet, oi viet
han lanh » han danh, hat lanh, thanh lanh
dao viet » so viet, o viet
caoc cay » cuoc chay, cao cap, cho cay
dang vat » dang van, dong vat, dang nhat
cua cay » cua cac
va caoc » va cac, va cuoc, va cao
yang va » hang va, bang va, sang va
cac cay » ca cay, cac cam, cac cap
lanh va » hanh va, anh va, lanh dao
cac tay » cac tac, cac tai, cac tap
dang va » dang van, hang va, dung va
cau cay » chau cay, cau xay, dau cay
cay co » cac co, tay co, cay cong
co loi » co hoi

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