Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
sach ty » sach y, sach tu, sach thu
vi cua » vai cua, di cua
xuc va » duc va, tuc va, luc va
ve cac » va cac
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 ty ((nang xa) or (nang x)) hoi. hieu ((ve cac) OR (vien cac)) xuc va dinh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang x)) hoi. hieu ((ve cac) OR (vien cac)) xuc va dinh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) or (nang x)) hoi. hieu ((ve cac) OR (vien cac)) xuc va dinh vi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (nang x)) hoi. hieu ((ve cac) OR (vien cac)) xuc va dinh vi cua te*.