Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cao » trinh chao, trinh co, trinh cau
cay cong » cac cong, cao cong, cau cong
thi viet » thi lien
co thai » ca thai, co hai, co thi
cua cay » cua cac
do thai » do thi, toc thai
cao lan » cao van, cao dang, cao tang
lan cho » san cho, van cho, han cho
cho cua » co cua, chi cua, cho ca
lan va » luan va, lanh va, lan van
va cua » va chua, via cua, ca cua

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 lan va cua cay cong ((mai viet) or (thi viet)) nam ) or ( chuong trinh cao lan cho cua cay ((co thai) or (do thai)) viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong trinh cao lan va cua cay cong ((mai viet) OR (thi viet)) nam ) OR ( chuong trinh cao lan cho cua cay ((co thai) OR (do thai)) viet nam )).
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh cao lan va cua cay cong ((mai viet) or (thi viet)) nam ) or ( chuong trinh cao lan cho cua cay ((co thai) or (do thai)) viet nam ))*.