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, mien 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
vien nam » viet nam, vien dai, van nam
hien nam » hien nay, mien nam, huyen nam
tac van » tac vang, cac van, tac can
dia hoc » dia oc, dich hoc, dien hoc
tac dia » trac dia, tac gia, tac da
van hoc » van hoa
tac va » tac da, tac xa, tuc va
xa hoc » xa hoi, ta hoc
xa hoa » xa khoa, xa hoi, ma hoa

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 van 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)) vien 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 van 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)) vien nam ) OR ( doanh tac ((xa hoc) OR (xa hoa)) hien nam )))).
• Adding a wildcard symbol may retrieve word variants: (((( danh tac van 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)) vien nam ) or ( doanh tac ((xa hoc) or (xa hoa)) hien nam ))))*.