Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cao » trinh chao, trinh co, trinh cau
thai viet » thi viet, tai viet, mai viet
trinh cac » trinh cau, trinh chat, trinh chao
van chat » cao chat
chat cua » nhat cua, chat va, chat huu
soi viet » so viet, oi viet, noi viet
hoi viet » hai viet, oi viet, cuoi viet
doi viet » dai viet, oi viet, do viet
dang vat » dang van, dong vat, dang nhat
cac dang » cac dan, cac cong, cac van
cao van » cac van, dao van, cao tang
cua cay » cua cac
cay cot » cay co, cay coc, cac cot
may co » cay co, tay co, lay co
may do » mau do
ca cac » cua cac, va cac
ca cay » cac cay, ca cao, va cay

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 van chat cua cay cot ((soi viet) or (doi viet)) nam ) or ((( chuong trinh cao dang vat ((ca cay) or (ca cac)) co ((hoi viet) OR (thai viet)) nam ) or ( chuong trinh cac dang vat co ((((may co) or (may do))) or (may cd)) ((hoi viet) OR (thai viet)) nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong trinh cao van chat cua cay cot ((soi viet) OR (doi viet)) nam ) OR ((( chuong trinh cao dang vat ((ca cay) OR (ca cac)) co ((hoi viet) OR (thai viet)) nam ) OR ( chuong trinh cac dang vat co ((((may co) OR (may do))) OR (may cd)) ((hoi viet) OR (thai viet)) nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong trinh cao van chat cua cay cot ((soi viet) or (doi viet)) nam ) or ((( chuong trinh cao dang vat ((ca cay) or (ca cac)) co ((hoi viet) OR (thai viet)) nam ) or ( chuong trinh cac dang vat co ((((may co) or (may do))) or (may cd)) ((hoi viet) OR (thai viet)) nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh cao van chat cua cay cot ((soi viet) or (doi viet)) nam ) or ((( chuong trinh cao dang vat ((ca cay) or (ca cac)) co ((hoi viet) OR (thai viet)) nam ) or ( chuong trinh cac dang vat co ((((may co) or (may do))) or (may cd)) ((hoi viet) OR (thai viet)) nam ))))*.