Perhaps you should try some spelling variations:
trinh chao » trinh chat, trinh han, trinh giao
trinh cham » trinh chat, trinh han, trinh phan
cuoi viet » nguoi viet, co viet, nuoc viet
trinh cau » trinh chat, trinh tu, trinh han
lanh bao » lanh dao, doanh bao, lanh bang
trinh do » trinh ky
trinh co » trinh cong, trinh hoa, trinh ky
doanh va » doan va, doanh tai, doanh cua
cot soi » cot loi, cong soi
cac tap » cac cap, cac tac, cac tai
chat do » chat deo, chat doc, chat co
do cuoi » do choi, dam cuoi, do nguoi
co soi » co so, co hoi, co loi

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 cham) OR (trinh cau)) doanh va cac tap ((co soi) OR (cot soi)) viet nam ) OR ( chuong ((trinh chao) OR (((trinh co) OR (trinh do)))) lanh bao cao chat do cuoi viet nam ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong ((trinh cham) or (trinh cau)) doanh va cac tap ((co soi) or (cot soi)) viet nam ) or ( chuong ((trinh chao) or (((trinh co) OR (trinh do)))) lanh bao cao chat do cuoi viet nam ))~".
• Adding a wildcard symbol may retrieve word variants: (( chuong ((trinh cham) or (trinh cau)) doanh va cac tap ((co soi) or (cot soi)) viet nam ) or ( chuong ((trinh chao) or (((trinh co) OR (trinh do)))) lanh bao cao chat do cuoi viet nam ))*.