Perhaps you should try some spelling variations:
dinh duy » dinh duc, dinh du, dinh quy
vu sach » vu bach, vu khach
cam tuc » cam xuc, cam tu, nam thuc
duy cua » day cua, dung cua
su sach » so sach
mang xa » lang xa, mang may, dang xay
hieu va » lieu va
va dinh » van dinh, va kinh, va tinh
tuc va » thuc va, truc va, tuc xa
cua te » cua tu
y mang » cay mang

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

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