Perhaps you should try some spelling variations:
thoi hien » thi hien, thoi mien, thuc hien
doanh tac » doanh tai, doanh bac, doanh thuc
vien nam » viet nam, vien dai, van nam
viet dai » vien dai, viet da, viet dao
hien nam » phien nam, hien nay, mien nam
danh tac » canh tac, danh bac, doanh tai
hoi hien » hoa hien, hoi vien, doi hien
hoc vien » hoc tieng, hoc vi
vaen dai » vien dai, van dai, vien da
hoc vaen » hoc van, hoc dan, hoc va
tap van » tap va, tap vat, tap quan
ban tay » ban tai, ban than, gian tay
xay hoc » day hoc, xa hoc
tac xay » tap xay, tac cay, tai xay
anh tap » anh ta, anh tai, anh tuan
xa thoi » xa khoi, xa thai, cac thoi
tay van » tay ban, ty van, may van
anh va » hanh va
tac xa » tuc xa, tac da
vi nam » voi nam, va nam, ii nam
hoa vi » hoa vo, hoa li, hoa viet

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((((( anh va van hoc vaen dai ) OR ((( anh tap van hoc viet dai ) OR ( anh tap van hoc hien dai ))))) OR ( ban tay van hoa vi nam ))) OR ((((( danh tac xa thoi hien nam ) OR ( danh tac xa hoi hien nam ))) OR ( doanh tac xay hoc vien nam ))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((((( anh va van hoc vaen dai ) or ((( anh tap van hoc viet dai ) OR ( anh tap van hoc hien dai ))))) or ( ban tay van hoa vi nam ))) or ((((( danh tac xa thoi hien nam ) or ( danh tac xa hoi hien nam ))) or ( doanh tac xay hoc vien nam ))))~".
• Adding a wildcard symbol may retrieve word variants: (((((( anh va van hoc vaen dai ) or ((( anh tap van hoc viet dai ) OR ( anh tap van hoc hien dai ))))) or ( ban tay van hoa vi nam ))) or ((((( danh tac xa thoi hien nam ) or ( danh tac xa hoi hien nam ))) or ( doanh tac xay hoc vien nam ))))*.