Perhaps you should try some spelling variations:
khoa tieng » thoai tieng, khoa tinh, cho tieng
thien nam » thien tam, thien nang, thien nhan
bac thang » bac thanh, bao thang, ban hang
duc thien » duc chien, duc tien, bui thien
canh phap » danh phap, anh phap, hanh phap
chien nam » hien nay, vien nam, chi nam
phien nam » hien nay, phien ban, vien nam
hoc tieng » hoc hien
cong tac » cong ty
tac hang » tac chong, thai hang, dac thang
va phien » va hien, va nghien, cac phien
tac vang » cac van, tac dung, tac dong
cong bac » dong bac, cong cac, cong ba
thang va » trang va, thong va, thanh va
va chien » van chien, va hien, va chiet
nang duc » nang luc, nang doc, nang du
canh tac » canh tay, canh giac, anh ta

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 vang ((khoa tieng) or (hoc tieng)) nam ) or ((( cong tac hang va phien nam ) or ((( cong bac thang va phien nam ) or ( cong bac thang va chien nam ))))))) or ( canh phap nang duc thien nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( canh tac vang ((khoa tieng) OR (hoc tieng)) nam ) OR ((( cong tac hang va phien nam ) OR ((( cong bac thang va phien nam ) OR ( cong bac thang va chien nam ))))))) OR ( canh phap nang duc thien nam )).
• Adding a wildcard symbol may retrieve word variants: (((( canh tac vang ((khoa tieng) or (hoc tieng)) nam ) or ((( cong tac hang va phien nam ) or ((( cong bac thang va phien nam ) or ( cong bac thang va chien nam ))))))) or ( canh phap nang duc thien nam ))*.