Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh chat » tinh chat, trinh luat, trinh han
trinh chao » trinh han, trinh co, trinh giao
trinh cao » trinh co, trinh cau, tinh cao
chat lan » chat ban, chat ran, chat van
soi viet » so viet, oi viet, doi viet
hoi viet » hai viet, oi viet, thai viet
cac cay » ca cay, cac cam, cac cap
cac tai » cao tai, cac dai, cac toi
danh va » doanh va, hanh va, anh va
co hoi » co hoc, co loi
cam co » cac co, cay co, lam co
nam co » nam cao, nam bo, nam so
lan va » luan va, lanh va, lan van

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) OR (trinh chao)) danh va cac ((cam co) or (nam co)) soi viet nam ) or ( chuong trinh chat lan va ((cac cay) or (((cac tai) or (cac bai)))) co hoi viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong ((trinh cao) OR (trinh chao)) danh va cac ((cam co) OR (nam co)) soi viet nam ) OR ( chuong trinh chat lan va ((cac cay) OR (((cac tai) OR (cac bai)))) co hoi viet nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong ((trinh cao) OR (trinh chao)) danh va cac ((cam co) or (nam co)) soi viet nam ) or ( chuong trinh chat lan va ((cac cay) or (((cac tai) or (cac bai)))) co hoi viet nam ))".
• Adding a wildcard symbol may retrieve word variants: (( chuong ((trinh cao) OR (trinh chao)) danh va cac ((cam co) or (nam co)) soi viet nam ) or ( chuong trinh chat lan va ((cac cay) or (((cac tai) or (cac bai)))) co hoi viet nam ))*.