Perhaps you should try some spelling variations:
trinh chao » trinh chat, trinh han, trinh co
choi viet » cuoi viet, chi viet, thoai viet
hoi viet » hai viet, oi viet, thai viet
doanh va » doan va, doanh tai, doanh cua
lanh va » hanh va, anh va, lang van
cao cap » cao chat
dao cao » dao tao, bao cao, tao cao
cac tap » cac cap, cac tac, cac tai
cot soi » cot loi, cong soi
co soi » co so, co hoi, co loi
cap do » cau do

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