Perhaps you should try some spelling variations:
trinh chat » tinh chat, trinh luat, trinh han
cong thanh » dong thanh, cong tan, truong thanh
trinh chao » trinh han, trinh giao, trinh phan
trinh hoa » trinh do, trinh han
thai viet » thi viet, tai viet, mai viet
cong hanh » cong khanh, hong hanh, song hanh
cuoi viet » nguoi viet, co viet, nuoc viet
trinh co » trinh do, trinh cong, trinh ky
hoc viet » hoc hien
co cuoi » co nuoi, cho cuoc, co nguoi
cao cay » cao cap, cho cay, tao cay
vat cao » va cao, vat co, vat cach
van vat » van chat, nhan vat
cac cay » ca cay, cac cam, cac cap
do thai » do thi, toc thai
can ban » van ban, toan ban
va can » va chan, va cao, va con
cay co » cac co, tay co, cay cong
lan va » luan va, lanh va, lan van

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 ((cong hanh) or (cong thanh)) va cac cay co hoc viet nam ) or ( cong ((trinh co) or (trinh hoa)) lan va can ban do thai viet nam ))) or ( cong ((trinh chao) OR (trinh chat)) van vat cao cay co cuoi viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( cong trinh ((cong hanh) OR (cong thanh)) va cac cay co hoc viet nam ) OR ( cong ((trinh co) OR (trinh hoa)) lan va can ban do thai viet nam ))) OR ( cong ((trinh chao) OR (trinh chat)) van vat cao cay co cuoi viet nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( cong trinh ((cong hanh) or (cong thanh)) va cac cay co hoc viet nam ) or ( cong ((trinh co) or (trinh hoa)) lan va can ban do thai viet nam ))) or ( cong ((trinh chao) OR (trinh chat)) van vat cao cay co cuoi viet nam ))".
• Adding a wildcard symbol may retrieve word variants: (((( cong trinh ((cong hanh) or (cong thanh)) va cac cay co hoc viet nam ) or ( cong ((trinh co) or (trinh hoa)) lan va can ban do thai viet nam ))) or ( cong ((trinh chao) OR (trinh chat)) van vat cao cay co cuoi viet nam ))*.