Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, gian cac
tu sach » thu sach, su sach, te sach
vien da » vien dai, hien dai
nang xa » lang xa, nang ma, mang xa
dinh di » dinh du, dinh vi, danh di
va dinh » van dinh, va kinh, va tinh
sach ky » sac ky, sach y, sach ty
di cua » dai cua, doi cua, de cua
cua te » cua tu
du va » dau va, tu va, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang xa) or (nang x)) hoi. hieu ((vien cac) or (vien da)) du va dinh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang x)) hoi. hieu ((vien cac) OR (vien da)) du va dinh di cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang x)) hoi. hieu ((vien cac) or (vien da)) du va dinh di cua te*.