Perhaps you should try some spelling variations:
dung hoan » dung toan, dung hoa, dung hoai
thien nam » phien nam, thien tam, thien nang
hang khoa » dung khoa
canh tac » canh tay, canh giac, cong tac
tac dung » sach dung, xay dung, tin dung
hang hoa » thanh hoa, hang va
hien nam » phien nam, hien nay, vien nam
tac dong » tac trong, ha dong, lao dong
dong hoa » dong hoc, dong co
hoa hien » hoc hien, hoa bien, hoa huyen

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((( canh tac dung hoan thien nam ) or ( canh tac ((hang hoa) or (hang khoa)) hien nam ))) or ( canh tac dong hoa hien nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( canh tac dung hoan thien nam ) OR ( canh tac ((hang hoa) OR (hang khoa)) hien nam ))) OR ( canh tac dong hoa hien nam )).
• Adding a wildcard symbol may retrieve word variants: (((( canh tac dung hoan thien nam ) or ( canh tac ((hang hoa) or (hang khoa)) hien nam ))) or ( canh tac dong hoa hien nam ))*.