Perhaps you should try some spelling variations:
trinh cao » trinh chao, trinh co, trinh cau
trinh cac » trinh cau, trinh chat, trinh chao
trinh cay » trinh cau, trinh may, trinh bay
cong goi » cong noi, cong soi, dong goi
cay cong » cac cong, cao cong, cau cong
hoa tang » hoa trang, hoa lang, hoa tan
lanh van » lang van, anh van, lanh va
goi viet » gioi viet, doi viet, gai viet
hoi viet » hai viet, thai viet, cuoi viet
cao lan » cao van, cao dang, cao tang
van cac » van hac, van cau, van bac
oi viet » o viet, cuoi viet, gioi viet
ha tang » phap tang, cao tang, kho tang
cac cay » ca cay, cac cam, cac cap
co hoi » co hoc, co loi
cay co » cac co, tay co
lan va » luan va, lanh va, lan van
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 cac cay co hoi viet nam ) or ( cong ((trinh cay) or (trinh cac)) lanh van cac cay co oi viet nam ))) or ( cong trinh ((hoa tang) OR (ha tang)) van cac cay cong goi viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( cong trinh cao lan va cac cay co hoi viet nam ) OR ( cong ((trinh cay) OR (trinh cac)) lanh van cac cay co oi viet nam ))) OR ( cong trinh ((hoa tang) OR (ha tang)) van cac cay cong goi viet nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( cong trinh cao lan va cac cay co hoi viet nam ) or ( cong ((trinh cay) or (trinh cac)) lanh van cac cay co oi viet nam ))) or ( cong trinh ((hoa tang) OR (ha tang)) van cac cay cong goi viet nam ))".
• Adding a wildcard symbol may retrieve word variants: (((( cong trinh cao lan va cac cay co hoi viet nam ) or ( cong ((trinh cay) or (trinh cac)) lanh van cac cay co oi viet nam ))) or ( cong trinh ((hoa tang) OR (ha tang)) van cac cay cong goi viet nam ))*.