Perhaps you should try some spelling variations:
vien dai » hien dai
vien cac » vien bach, gian cac, vien va
vien da » hien dai
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
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 hoi. hieu ((((vien cac) OR (vien dai))) or (vien da)) du va danh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((((vien cac) OR (vien dai))) OR (vien da)) du va danh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((((vien cac) OR (vien dai))) or (vien da)) du va danh di cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((((vien cac) OR (vien dai))) or (vien da)) du va danh di cua te*.