Perhaps you should try some spelling variations:
hoc nghien » hoc hien
nghien nam » nghiep nam, nguyen nam, nghe nam
phien nam » hien nay, phien ban, vien nam
thong nam » thong xay, dong nam, thong va
tieng han » tieng anh
doanh tac » doanh tai, doanh bac, doanh thuc
hoc phien » hoc hien, thuoc phien, hoc phan
danh tac » canh tac, danh bac, doanh tai
mien nam » vien nam, viet nam, hien nay
hien nam » hien nay, vien nam, huyen nam
tac dan » tac danh, cac dan, tac da
dia hoc » dia oc, dich hoc, dien hoc
tac dia » trac dia, tac gia, tac da
dan hoc » van hoc, dan toc, dai hoc
tac va » tac da, tac xa, tuc va
xa hoc » xa hoi, ta hoc
xa hoa » xa khoa, xa hoi, ma hoa
va hoc » van hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((( danh tac dan hoc ((thong nam) or (tieng han)) ) or ((( danh tac dia hoc phien nam ) or ( danh tac va hoc nghien nam ))))) or ((( doanh tac ((xa hoc) OR (xa hoa)) mien nam ) or ( doanh tac ((xa hoc) OR (xa hoa)) hien nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( danh tac dan hoc ((thong nam) OR (tieng han)) ) OR ((( danh tac dia hoc phien nam ) OR ( danh tac va hoc nghien nam ))))) OR ((( doanh tac ((xa hoc) OR (xa hoa)) mien nam ) OR ( doanh tac ((xa hoc) OR (xa hoa)) hien nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( danh tac dan hoc ((thong nam) or (tieng han)) ) or ((( danh tac dia hoc phien nam ) or ( danh tac va hoc nghien nam ))))) or ((( doanh tac ((xa hoc) OR (xa hoa)) mien nam ) or ( doanh tac ((xa hoc) OR (xa hoa)) hien nam ))))".
• Adding a wildcard symbol may retrieve word variants: (((( danh tac dan hoc ((thong nam) or (tieng han)) ) or ((( danh tac dia hoc phien nam ) or ( danh tac va hoc nghien nam ))))) or ((( doanh tac ((xa hoc) OR (xa hoa)) mien nam ) or ( doanh tac ((xa hoc) OR (xa hoa)) hien nam ))))*.