Perhaps you should try some spelling variations:
chuong trinh » cong trinh
chuong tinh » khuong tinh, thuong tinh, phuong trinh
trinh cau » trinh chat, trinh chao, trinh tu
cau lanh » cau danh, cay lanh, dau lanh
soi viet » so viet, hoi viet, oi viet
cao lanh » cao lan, cao danh, cay lanh
cac tai » cao tai, cac bai, cac dai
cac tac » cac toc, cac bac, cac dac
cac tap » cac cap
lanh va » hanh va, anh va, lanh dao
cao anh » cao dang, cao tang, cao bang
cam co » cac co, cay co, lam co
co soi » cot soi, co so, co hoi
nam co » nam cao, nam bo, nam so

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( chuong tinh ((cao lanh) OR (cao anh)) va cac ((cam co) or (nam co)) soi viet nam ) or ( chuong trinh cau lanh va ((((cac tap) or (cac tac))) or (cac tai)) co soi viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong tinh ((cao lanh) OR (cao anh)) va cac ((cam co) OR (nam co)) soi viet nam ) OR ( chuong trinh cau lanh va ((((cac tap) OR (cac tac))) OR (cac tai)) co soi viet nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong tinh ((cao lanh) OR (cao anh)) va cac ((cam co) or (nam co)) soi viet nam ) or ( chuong trinh cau lanh va ((((cac tap) or (cac tac))) or (cac tai)) co soi viet nam ))".
• Adding a wildcard symbol may retrieve word variants: (( chuong tinh ((cao lanh) OR (cao anh)) va cac ((cam co) or (nam co)) soi viet nam ) or ( chuong trinh cau lanh va ((((cac tap) or (cac tac))) or (cac tai)) co soi viet nam ))*.