Perhaps you should try some spelling variations:
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
dinh du » dinh duc, dinh cu, dinh tu
hieu ve » hieu va, hieu van
du cua » duy cua, dau cua, dum cua
tuc va » thuc va, truc va, tuc xa
xuc va » duc va, luc va, xac va
ve cac » va cac, vien cac
sach v » sach va, sach y, sach 2
cua te » cua tu

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 v ((nang xa) OR (nang x)) hoi. hieu ve cac ((xuc va) or (tuc va)) dinh du cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v ((nang xa) OR (nang x)) hoi. hieu ve cac ((xuc va) OR (tuc va)) dinh du cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v ((nang xa) OR (nang x)) hoi. hieu ve cac ((xuc va) or (tuc va)) dinh du cua te".
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang xa) OR (nang x)) hoi. hieu ve cac ((xuc va) or (tuc va)) dinh du cua te*.