Perhaps you should try some spelling variations:
trinh chao » trinh chat, trinh han, trinh giao
trinh cao » trinh cau, tinh cao, trinh cho
chua cay » chua chay, chua may, chua cau
trinh co » trinh do, trinh cong, trinh hoa
cao luan » cao quan, cao xuan, dao luan
soi viet » hoi viet, oi viet, doi viet
cong soi » cong so, cong goi, cong noi
cay cong » cac cong, cao cong, cau cong
va chua » vua chua, ca chua, va chu
luan va » luan van, luat va
cua cay » cua cac
cao lan » cao van, cao dang, cao tang
so viet » hoc viet
cao cay » cao cap, cho cay, tao cay
cay co » cac co, tay co
va cao » va cac, va co, va dao
lan va » lanh va, lan van, lang va
va cua » via cua, ca cua, ma 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 chao) OR (trinh co)) lan va cao cay co so viet nam ) or ((( cong trinh cao lan va cua cay cong soi viet nam ) or ( chuong trinh cao luan va chua cay cong soi viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong ((trinh chao) OR (trinh co)) lan va cao cay co so viet nam ) OR ((( cong trinh cao lan va cua cay cong soi viet nam ) OR ( chuong trinh cao luan va chua cay cong soi viet nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong ((trinh chao) OR (trinh co)) lan va cao cay co so viet nam ) or ((( cong trinh cao lan va cua cay cong soi viet nam ) or ( chuong trinh cao luan va chua cay cong soi viet nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( chuong ((trinh chao) OR (trinh co)) lan va cao cay co so viet nam ) or ((( cong trinh cao lan va cua cay cong soi viet nam ) or ( chuong trinh cao luan va chua cay cong soi viet nam ))))*.