Perhaps you should try some spelling variations:
trinh khau » trinh khai, trinh kham, trinh khac
trinh nhan » trinh han, trinh phan, trinh nha
trinh bao » trinh ban, trinh bay, trinh cao
trinh dao » trinh do, trinh da, trinh dan
nhan dang » nhan dan, phan dang, tran dang
khau luat » khau luan, thau luat, phap luat
hai viet » thai viet, mai viet, tai viet
dang van » hoang van, hang va
doi viet » dai viet, hoi viet, oi viet
cac cau » bac cau, ca cau, cac cam
cac mau » cam mau, sach mau
luat va » xuat va, luat ve, suat va
cac cay » ca cay, cac cam, cac cap
van cac » van hac, van cau, van bac
quan va » quan vi, quan ha, luan va
co doi » cho doi, co dot, co dai
cay co » cac co, tay co, cay cong
co dan » ca dan, cao dang
co hai » co dai, co hoi, o hai
co dat » coc dat, co dot, co dai
ca cac » cua cac, va cac
va ca » va cac, va cao, va cai

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 bao) or (trinh dao)) quan va ((cac cau) or (cac mau)) co hai viet nam ) or ((( cong trinh khau luat va ca cac ((co dat) or (((co dan) OR (co ban)))) viet nam ) or ( cong trinh nhan dang van cac cay co doi viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong ((trinh bao) OR (trinh dao)) quan va ((cac cau) OR (cac mau)) co hai viet nam ) OR ((( cong trinh khau luat va ca cac ((co dat) OR (((co dan) OR (co ban)))) viet nam ) OR ( cong trinh nhan dang van cac cay co doi viet nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong ((trinh bao) or (trinh dao)) quan va ((cac cau) or (cac mau)) co hai viet nam ) or ((( cong trinh khau luat va ca cac ((co dat) or (((co dan) OR (co ban)))) viet nam ) or ( cong trinh nhan dang van cac cay co doi viet nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( cong ((trinh bao) or (trinh dao)) quan va ((cac cau) or (cac mau)) co hai viet nam ) or ((( cong trinh khau luat va ca cac ((co dat) or (((co dan) OR (co ban)))) viet nam ) or ( cong trinh nhan dang van cac cay co doi viet nam ))))*.