Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
danh vai » danh sai, danh va, dang van
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
dao duc » giao duc, tao duoc
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky dang xa hoi. hieu va dao duc va ((danh vai) or (doanh van)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu va dao duc va ((danh vai) OR (doanh van)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu va dao duc va ((danh vai) or (doanh van)) cau tren*.