Perhaps you should try some spelling variations:
trinh cham » trinh chat, trinh chao, trinh han
trinh cau » trinh chat, trinh chao, trinh tu
thai viet » thi viet, tai viet, mai viet
loi viet » loai viet, hoi viet, oi viet
cham anh » pham anh, pham hanh, cham binh
cot thai » co thai, chat thai, cong thai
soi viet » so viet, hoi viet, oi viet
cau anh » cau danh, cau lanh, cuu anh
cac cap » cac cam, cac cau, cac cay
cap cot » cac cot
cot loi » co loi, cot soi, mot loai
co soi » cot soi, co so, co hoi
anh va » hanh va

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 cau anh va ((cao cap) OR (cao chat)) co soi viet nam ) or ((( cong trinh cham anh va cac cap cot loi viet nam ) or ( cong trinh cham anh va cac cap cot thai viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh cau anh va ((cao cap) OR (cao chat)) co soi viet nam ) OR ((( cong trinh cham anh va cac cap cot loi viet nam ) OR ( cong trinh cham anh va cac cap cot thai viet nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh cau anh va ((cao cap) OR (cao chat)) co soi viet nam ) or ((( cong trinh cham anh va cac cap cot loi viet nam ) or ( cong trinh cham anh va cac cap cot thai viet nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( cong trinh cau anh va ((cao cap) OR (cao chat)) co soi viet nam ) or ((( cong trinh cham anh va cac cap cot loi viet nam ) or ( cong trinh cham anh va cac cap cot thai viet nam ))))*.