Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, gian cac
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
vien da » vien dai, hien dai
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
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 hoi. hieu ((vien cac) OR (vien da)) du va danh di cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu ((vien cac) OR (vien da)) du va danh di cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu ((vien cac) OR (vien da)) du va danh di cua te*.