Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh chao » trinh chat, trinh han, trinh giao
trinh cau » trinh chat, trinh tu, trinh han
trinh co » trinh do, trinh cong, trinh hoa
hoi viet » hai viet, oi viet, thai viet
cho can » cho cac, cho phan, cho cong
cho cay » cho cac, cho vay, cho ca
lan van » luan van, lang van, tan van
cau lan » cau lanh, cao lan, sau lan
cao tai » cao tang
co hoi » co hoc, co loi
lan va » luan va, lanh va, lang va
va cao » va cac, va co, va dao
tai co » mai co, tai so, tri co

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