Perhaps you should try some spelling variations:
trinh cham » trinh chat, trinh chao, trinh han
trinh cau » trinh chat, trinh chao, trinh tu
cham anh » pham anh, pham hanh, cham binh
hoi viet » hai viet, oi viet, thai viet
soi viet » oi viet, doi viet, noi viet
cam con » cam chan, dam cong, cach con
cam cot » cac cot
cau anh » cau danh, cau lanh, cuu anh
cac cam » cad cam, cac cap, cac cau
so viet » hoc viet
anh va » hanh va
va cad » va cao, va cai, va cam
va cau » van cau, va dau, va cao
cam co » cac co, nam co, cay co
con so » cong so, hon so, con bo

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong trinh cau anh va cac cam co ((soi viet) OR (hoi viet)) nam ) OR ((( cong trinh cham anh ((va cad) OR (va cau)) cam cot ((soi viet) OR (hoi viet)) nam ) OR ( cong trinh cham anh ((va cad) OR (va cau)) cam con so viet nam ))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong trinh cau anh va cac cam co ((soi viet) or (hoi viet)) nam ) or ((( cong trinh cham anh ((va cad) OR (va cau)) cam cot ((soi viet) or (hoi viet)) nam ) or ( cong trinh cham anh ((va cad) OR (va cau)) cam con so viet nam ))))~".
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh cau anh va cac cam co ((soi viet) or (hoi viet)) nam ) or ((( cong trinh cham anh ((va cad) OR (va cau)) cam cot ((soi viet) or (hoi viet)) nam ) or ( cong trinh cham anh ((va cad) OR (va cau)) cam con so viet nam ))))*.