Perhaps you should try some spelling variations:
hoc nghuyen » hoc chuyen, hoc nghien, thuoc nguyen
nghuyen nam » nguyen nam, huyen nam
doanh tac » doanh tai, doanh bac, doanh thuc
tieng nam » tieng lam, tieng nhat, tieng han
phien nam » hien nay, vien nam, phien hai
danh tac » canh tac, danh bac, doanh tai
mien nam » vien nam, viet nam, hien nay
hoc mien » hoc vien, ho mien, hoc lien
hien nam » hien nay, vien nam, huyen nam
dia hoc » dia oc, dich hoc, dien hoc
tac dia » trac dia, tac gia, tac da
dan hoc » van hoc, dan toc, toan hoc
tac va » tac da, tuc va, tac ha
va hoc » van hoc
tac xa » tuc xa, tac da
xa hoc » xa hoi, xa hoa, ta 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) OR (dai hoc)) tieng nam ) or ((( danh tac dia hoc ((phien nam) or (phien ban)) ) or ( danh tac va hoc nghuyen nam ))))) or ((( doanh tac xa hoc mien nam ) or ( doanh tac xa hoc hien nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( danh tac ((dan hoc) OR (dai hoc)) tieng nam ) OR ((( danh tac dia hoc ((phien nam) OR (phien ban)) ) OR ( danh tac va hoc nghuyen nam ))))) OR ((( doanh tac xa hoc mien nam ) OR ( doanh tac xa hoc hien nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( danh tac ((dan hoc) OR (dai hoc)) tieng nam ) or ((( danh tac dia hoc ((phien nam) or (phien ban)) ) or ( danh tac va hoc nghuyen nam ))))) or ((( doanh tac xa hoc mien nam ) or ( doanh tac xa hoc hien nam ))))".
• Adding a wildcard symbol may retrieve word variants: (((( danh tac ((dan hoc) OR (dai hoc)) tieng nam ) or ((( danh tac dia hoc ((phien nam) or (phien ban)) ) or ( danh tac va hoc nghuyen nam ))))) or ((( doanh tac xa hoc mien nam ) or ( doanh tac xa hoc hien nam ))))*.