Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh chat » tinh chat, trinh luat, trinh han
trinh cau » trinh chao, trinh tu, trinh han
soi viet » so viet, hoi viet, oi viet
cau lanh » cau danh, cay lanh, dau lanh
cac tai » cao tai, cac bai, cac dai
lanh va » hanh va, anh va, lanh dao
lan van » luan van, lang van, tan van
cac tay » cac cay, cac tac, cac tap
nam so » nam sao, nam bo
cam co » cac co, nam co, cay co
lan va » luan va, lang va, ban va
co soi » cot soi, co hoi, co loi

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 lanh va cac ((cam co) or (nam so)) soi viet nam ) or ( chuong trinh chat ((lan va) or (lan van)) ((cac tay) or (cac tai)) ((co soi) or (co so)) viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong trinh cau lanh va cac ((cam co) OR (nam so)) soi viet nam ) OR ( chuong trinh chat ((lan va) OR (lan van)) ((cac tay) OR (cac tai)) ((co soi) OR (co so)) viet nam )).
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh cau lanh va cac ((cam co) or (nam so)) soi viet nam ) or ( chuong trinh chat ((lan va) or (lan van)) ((cac tay) or (cac tai)) ((co soi) or (co so)) viet nam ))*.