Perhaps you should try some spelling variations:
trinh cac » trinh chat, trinh chao, trinh cham
trinh vat » trinh van, trinh luat, sinh vat
trinh mat » trinh may, trinh mau, trinh sat
trinh cau » trinh chat, trinh chao, trinh tu
cuoi viet » nguoi viet, co viet, nuoc viet
trinh cam » trinh cham, trinh tam, trinh cao
sach cap » sach dao, sach bai, sach xa
hoi viet » hai viet, thai viet, gioi viet
co nguoi » cho nguoi, con nguoi, o nguoi
cam doan » chan doan, cac doanh, cam hoang
cay cong » cac cong, cao cong, cau cong
va sach » van sach, va cach, a sach
oi viet » o viet, gioi viet, hoc viet
cac tap » cac cap, cac tac, cac tai
cac cay » ca cay, cac cam, cac cap
so viet » hoc viet
cong so » cong san, cong hoa
cau dan » cau danh, ca dan, cu dan
cac cau » cac mau, bac cau, ca cau
cau co » cau do, cac co, cay co
cap co » cap cho, tap co, cap do
dan va » dan ca, ban va, han va
co oi » co hoi, co loi, co doi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( cong trinh cac dan va cac cay cong so viet nam ) or ((((( cong trinh cam doan va sach cap co ((hoi viet) OR (cuoi viet)) nam ) or ( cong trinh cau dan va cac cau co oi viet nam ))) or ( cong ((trinh mat) or (trinh vat)) dan va cac tap ((co gioi) or (co nguoi)) viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh cac dan va cac cay cong so viet nam ) OR ((((( cong trinh cam doan va sach cap co ((hoi viet) OR (cuoi viet)) nam ) OR ( cong trinh cau dan va cac cau co oi viet nam ))) OR ( cong ((trinh mat) OR (trinh vat)) dan va cac tap ((co gioi) OR (co nguoi)) viet nam ))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh cac dan va cac cay cong so viet nam ) or ((((( cong trinh cam doan va sach cap co ((hoi viet) OR (cuoi viet)) nam ) or ( cong trinh cau dan va cac cau co oi viet nam ))) or ( cong ((trinh mat) or (trinh vat)) dan va cac tap ((co gioi) or (co nguoi)) viet nam ))))*".