Perhaps you should try some spelling variations:
trinh cao » trinh chao, trinh co, trinh cau
trinh cay » trinh cau, trinh may, trinh bay
trinh hoa » trinh do, trinh han
trinh cac » trinh cau, trinh chat, trinh chao
dung goi » dung doi, dung moi, dung nguoi
cay dung » xay dung, cay rung, gay dung
hoa tang » hoa trang, ha tang, hoa lang
hoi viet » hai viet, thai viet, cuoi viet
goi viet » gioi viet, doi viet, gai viet
van cac » van hac, van bac, dan cac
van cau » van dau, van hau, van chat
oi viet » o viet, cuoi viet, gioi viet
cac cay » ca cay, cac cam, cac cap
lanh va » hanh va, anh va, lanh dao
co hoi » co hoc, co loi
cay co » cac co, tay co, cay cong
lan va » luan va, lan van, lang va
co oi » co loi, co doi, co toi

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 ((lan va) or (lanh va)) cac cay co hoi viet nam ) or ( cong ((trinh cay) or (trinh cac)) lanh ((van cac) or (van cau)) cay co oi viet nam ))) or ( cong trinh hoa tang ((van cac) or (van cau)) cay dung goi viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( cong trinh cao ((lan va) OR (lanh va)) cac cay co hoi viet nam ) OR ( cong ((trinh cay) OR (trinh cac)) lanh ((van cac) OR (van cau)) cay co oi viet nam ))) OR ( cong trinh hoa tang ((van cac) OR (van cau)) cay dung goi viet nam )).
• Adding a wildcard symbol may retrieve word variants: (((( cong trinh cao ((lan va) or (lanh va)) cac cay co hoi viet nam ) or ( cong ((trinh cay) or (trinh cac)) lanh ((van cac) or (van cau)) cay co oi viet nam ))) or ( cong trinh hoa tang ((van cac) or (van cau)) cay dung goi viet nam ))*.