Perhaps you should try some spelling variations:
hoc phien » hoc hien, thuoc phien, hoc nghien
phien nam » hien nay, phien ban, vien nam
cong tac » cong ty
mien nam » vien nam, viet nam, hien nay
hoc mien » hoc hien, hoc vien, ho mien
danh bac » doanh bac, danh bat, dan bac
danh tac » canh tac, doanh tai, danh thuc
canh tay » canh tac, thanh tay, anh ta
hoc van » hoc dan, hoc va, hoc vat
tac xa » tuc xa, tac da
xa hoc » xa hoi, xa hoa, ta hoc
tac va » tac da, tuc va, tac ha
ha hoc » hoa hoc, nha hoc, ha hoa
va hoc » van hoc
a hoa » va hoa, ba hoa, xa 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 va hoc van nam ) or ( ((canh tay) or (cong tac)) va hoc van nam ))) or ( danh tac xa hoc phien nam ))) or ((( danh bac ha hoc mien nam ) or ( danh bac ((a hoa) OR (ma hoa)) mien nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((( danh tac va hoc van nam ) OR ( ((canh tay) OR (cong tac)) va hoc van nam ))) OR ( danh tac xa hoc phien nam ))) OR ((( danh bac ha hoc mien nam ) OR ( danh bac ((a hoa) OR (ma hoa)) mien nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((((( danh tac va hoc van nam ) or ( ((canh tay) or (cong tac)) va hoc van nam ))) or ( danh tac xa hoc phien nam ))) or ((( danh bac ha hoc mien nam ) or ( danh bac ((a hoa) OR (ma hoa)) mien nam ))))".
• Adding a wildcard symbol may retrieve word variants: (((((( danh tac va hoc van nam ) or ( ((canh tay) or (cong tac)) va hoc van nam ))) or ( danh tac xa hoc phien nam ))) or ((( danh bac ha hoc mien nam ) or ( danh bac ((a hoa) OR (ma hoa)) mien nam ))))*.