Perhaps you should try some spelling variations:
van dinh » van minh, van dich, va dinh
su sach » so sach, vu sach
xang xa » lang xa, ang xa, dang xay
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
dau duc » dao duc, dang duc, dau nuoc
duc van » duc va, duc tan, duc manh
di cua » dai cua, doi cua, de cua
vi cua » vai cua
va dau » 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 ty ((xang xa) OR (mang xa)) hoi. hieu va dau duc van dinh ((vi cua) or (di cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((xang xa) OR (mang xa)) hoi. hieu va dau duc van dinh ((vi cua) OR (di cua)) te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((xang xa) OR (mang xa)) hoi. hieu va dau duc van dinh ((vi cua) or (di cua)) te*".