Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cao » trinh chao, trinh co, trinh cau
trinh sau » trinh san, trinh cau, trinh su
cao xuat » cao xuan, cac xuat, san xuat
cay cong » cac cong, cao cong, cau cong
soi viet » so viet, oi viet, doi viet
hoi viet » hai viet, oi viet, thai viet
cac cam » cad cam, cac cap, cac cau
sau lan » dau luan
cac hat » cac chat, cac hoat, cau hat
cac nam » bac nam, cac ham, cai nam
cac cay » ca cay, cac cap, cac cau
lan va » luan va, lanh va, lan van
ky lan » ky dan, ky la
co hoi » co hoc, co loi
ca cau » cac cau, can cau, cua cau
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: (( chuong trinh cao xuat va cac cay cong ((soi viet) OR (hoi viet)) nam ) or ((( chuong trinh ky lan va ((cac nam) or (cac hat)) ((co oi) or (co hoi)) viet nam ) or ( chuong trinh sau lan va ((cac cam) or (ca cau)) co _ viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong trinh cao xuat va cac cay cong ((soi viet) OR (hoi viet)) nam ) OR ((( chuong trinh ky lan va ((cac nam) OR (cac hat)) ((co oi) OR (co hoi)) viet nam ) OR ( chuong trinh sau lan va ((cac cam) OR (ca cau)) co _ viet nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong trinh cao xuat va cac cay cong ((soi viet) OR (hoi viet)) nam ) or ((( chuong trinh ky lan va ((cac nam) or (cac hat)) ((co oi) or (co hoi)) viet nam ) or ( chuong trinh sau lan va ((cac cam) or (ca cau)) co _ viet nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh cao xuat va cac cay cong ((soi viet) OR (hoi viet)) nam ) or ((( chuong trinh ky lan va ((cac nam) or (cac hat)) ((co oi) or (co hoi)) viet nam ) or ( chuong trinh sau lan va ((cac cam) or (ca cau)) co _ viet nam ))))*.