Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
nam danh » nam dinh, nam dan
te sach » toc sach
sai cua » dai cua, hai cua, lai cua
xa danh » va danh, dia danh, van danh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
ve cac » va cac

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 ((ve cac) or (vien cac)) toc ((xa danh) OR (nam danh)) sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu ((ve cac) OR (vien cac)) toc ((xa danh) OR (nam danh)) sai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu ((ve cac) or (vien cac)) toc ((xa danh) OR (nam danh)) sai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu ((ve cac) or (vien cac)) toc ((xa danh) OR (nam danh)) sai cua tre*.