Perhaps you should try some spelling variations:
trinh mat » trinh vat, trinh may, trinh mau
lhoi viet » thoai viet, hoc viet, thi viet
chat dan » chat ban, chat ran, chat van
hoi viet » hai viet, oi viet, thai viet
cac tay » cac cay, cac tac, cac tai
hat dan » hat van, nhat danh, nhan dan
mat dan » luat dan, mat bang, mat hang
tay co » ty co, cay co, tay o
ca cac » cua cac
co hoi » co hoc, co loi

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 ((chat dan) OR (hat dan)) va cac tay co ((lhoi viet) or (hoa viet)) nam ) or ( cong trinh mat dan ca cac tay co hoi viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh ((chat dan) OR (hat dan)) va cac tay co ((lhoi viet) OR (hoa viet)) nam ) OR ( cong trinh mat dan ca cac tay co hoi viet nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh ((chat dan) OR (hat dan)) va cac tay co ((lhoi viet) or (hoa viet)) nam ) or ( cong trinh mat dan ca cac tay co hoi viet nam ))".
• Adding a wildcard symbol may retrieve word variants: (( cong trinh ((chat dan) OR (hat dan)) va cac tay co ((lhoi viet) or (hoa viet)) nam ) or ( cong trinh mat dan ca cac tay co hoi viet nam ))*.