Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
ban hang » ngan hang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van anh » van thanh, tuan anh, van minh
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: su sach ky nang xa hoi. hieu ((ve cac) OR (vien cac)) xuc ((ban hang) or (van anh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ((ve cac) OR (vien cac)) xuc ((ban hang) OR (van anh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu ((ve cac) OR (vien cac)) xuc ((ban hang) or (van anh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu ((ve cac) OR (vien cac)) xuc ((ban hang) or (van anh)) dai cua tre*.