Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cua » tinh cua, trinh luat, trinh quan
trinh mat » trinh vat, trinh may, trinh mau
trinh cay » trinh cau, trinh may, trinh cac
soi viet » so viet, oi viet, doi viet
hoi viet » hai viet, oi viet, thai viet
loi viet » loai viet, oi viet, doi viet
cai cay » cai cach, loai cay, chau cay
cac cac » cac cach, ca cac, cac bac
cua dan » cua dang, cua ban, ca dan
cay dan » cac dan, ca dan, cay lanh
cac cay » cac cam, cac cap, cac cau
mat dan » hat dan, luat dan, mat bang
cay coc » cay co, cay cong
co loi » co hoi
cac co » cac cong
ca cay » cua cay, ca cac, ca cao
dan va » doan va, dan ca, ban va
va cai » va bai, va dai, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((( chuong trinh cay dan va ((cac cay) OR (ca cay)) co ((soi viet) or (hoi viet)) nam ) or ( chuong trinh mat dan va cai cay coc ((soi viet) or (hoi viet)) nam ))) or ( chuong trinh cua dan va cac cac co loi viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( chuong trinh cay dan va ((cac cay) OR (ca cay)) co ((soi viet) OR (hoi viet)) nam ) OR ( chuong trinh mat dan va cai cay coc ((soi viet) OR (hoi viet)) nam ))) OR ( chuong trinh cua dan va cac cac co loi viet nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( chuong trinh cay dan va ((cac cay) OR (ca cay)) co ((soi viet) or (hoi viet)) nam ) or ( chuong trinh mat dan va cai cay coc ((soi viet) or (hoi viet)) nam ))) or ( chuong trinh cua dan va cac cac co loi viet nam ))".
• Adding a wildcard symbol may retrieve word variants: (((( chuong trinh cay dan va ((cac cay) OR (ca cay)) co ((soi viet) or (hoi viet)) nam ) or ( chuong trinh mat dan va cai cay coc ((soi viet) or (hoi viet)) nam ))) or ( chuong trinh cua dan va cac cac co loi viet nam ))*.