Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, gian cac
te sach » toc sach
vien da » vien dai, hien dai
nang xa » nang x, nang ma, mang xa
hanh di » hanh vi, hanh de, hang di
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
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: te sach ky ((nang xa) or (lang xa)) hoi. hieu ((vien cac) or (vien da)) du va hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (lang xa)) hoi. hieu ((vien cac) OR (vien da)) du va hanh di cua te.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang xa) or (lang xa)) hoi. hieu ((vien cac) or (vien da)) du va hanh di cua te*.