Perhaps you should try some spelling variations:
phuong trinh » cong trinh, huong tran, phuong anh
chuong trinh » cong trinh
trinh cau » trinh chat, trinh chao, trinh tu
trinh hoa » trinh han
trinh co » trinh cong, trinh ky, trinh tu
cac cong » cua cong
cong tac » cong ty
tac viet » bac viet, toc viet, tuc viet
hai viet » thai viet, mai viet, tai viet
ban cheo » han che, ban co, ban chat
trinh do » trinh ky
bang cho » sang cho, hang cho, tang cho
cheo cua » chuoi cua, co cua, chat cua
hoa bang » hoa lang, hoa nang, hoa vang
son hai » cong hai
cay son » cao son, tay son, may son
cho cua » co cua, chi cua, cho ca
do bang » do ban, do dang, do tang
cau lan » cau lanh, cao lan, sau lan
so hai » su hai, so ha, co hai
cay so » cay co, cay mo, cao so
va cua » va chua, via cua, ca cua
lan va » luan va, lanh va, lan van
cay o » cay co, cay mo, cay ot
o hai » co hai, o lai, _ hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( phuong trinh cau lan va cua cac cong tac viet nam ) or ((((( chuong trinh do bang cho cua cay so hai viet nam ) or ( chuong trinh hoa bang cho cua cay son hai viet nam ))) or ( chuong trinh co ban cheo cua cay o hai viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( phuong trinh cau lan va cua cac cong tac viet nam ) OR ((((( chuong trinh do bang cho cua cay so hai viet nam ) OR ( chuong trinh hoa bang cho cua cay son hai viet nam ))) OR ( chuong trinh co ban cheo cua cay o hai viet nam )))).
• Adding a wildcard symbol may retrieve word variants: (( phuong trinh cau lan va cua cac cong tac viet nam ) or ((((( chuong trinh do bang cho cua cay so hai viet nam ) or ( chuong trinh hoa bang cho cua cay son hai viet nam ))) or ( chuong trinh co ban cheo cua cay o hai viet nam ))))*.