Perhaps you should try some spelling variations:
hoa phien » hoa phan, hoa phi, hoa bien
canh tac » canh tay, canh giac, cong tac
tac dung » sach dung, xay dung, tin dung
dong hoc » dong luc
hoa hien » hoc hien, hoa bien, hoa huyen
tac hang » tac vang, bac thang, tac chong
dung hoa » dung khoa, duong hoa, dung hoai
hien nam » phien nam, hien nay, vien nam

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 hoa phien ban ) or ( canh tac hang ((hoa hien) OR (hoan thien)) nam ))) or ( canh tac ((dong hoc) or (dong co)) hien nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( canh tac dung hoa phien ban ) OR ( canh tac hang ((hoa hien) OR (hoan thien)) nam ))) OR ( canh tac ((dong hoc) OR (dong co)) hien nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( canh tac dung hoa phien ban ) or ( canh tac hang ((hoa hien) OR (hoan thien)) nam ))) or ( canh tac ((dong hoc) or (dong co)) hien nam ))".
• Adding a wildcard symbol may retrieve word variants: (((( canh tac dung hoa phien ban ) or ( canh tac hang ((hoa hien) OR (hoan thien)) nam ))) or ( canh tac ((dong hoc) or (dong co)) hien nam ))*.