Perhaps you should try some spelling variations:
van danh » van doanh, van anh, van hanh
su sach » so sach, vu sach
vang xa » lang xa, ang xa, dang xay
duy cua » day cua, dung cua
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
sach ly » sach y, sach lo, sach ty
cao tuc » dao tuc, cao duc, cao suc
tuc van » thuc van, truc van, tuc va
du cua » dau cua, dum cua, hu cua
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly ((vang xa) or (mang xa)) hoi. hieu va cao tuc van danh ((du cua) OR (duy cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly ((vang xa) OR (mang xa)) hoi. hieu va cao tuc van danh ((du cua) OR (duy cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly ((vang xa) or (mang xa)) hoi. hieu va cao tuc van danh ((du cua) OR (duy cua)) te".
• Adding a wildcard symbol may retrieve word variants: su sach ly ((vang xa) or (mang xa)) hoi. hieu va cao tuc van danh ((du cua) OR (duy cua)) te*.