Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cay » trinh cau, trinh may, trinh cac
trinh cua » tinh cua, trinh luat, trinh quan
trinh mat » trinh vat, trinh may, trinh mau
loi viet » loai viet, oi viet, doi viet
cai cach » loi cach, tai cac, va cach
soi viet » so viet, oi viet, doi viet
hoi viet » hai viet, oi viet, thai viet
cach coc » cach hoc, cach con, cach noi
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 » ca cay, cac cam, cac cap
mat dan » hat dan, luat dan, mat bang
cay co » tay co, cay cong
dan va » doan va, dan ca, ban va
cac co » cac cong
co loi » co hoi
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 co ((soi viet) or (hoi viet)) nam ) or ( chuong trinh mat dan va cai cach 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 co ((soi viet) OR (hoi viet)) nam ) OR ( chuong trinh mat dan va cai cach 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 co ((soi viet) or (hoi viet)) nam ) or ( chuong trinh mat dan va cai cach coc ((soi viet) or (hoi viet)) nam ))) or ( chuong trinh cua dan va cac cac co loi viet nam ))*.