Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van thanh » ban thanh, van tuan
giau cua » gian cua, gia cua, dieu cua
vien cac » vien bach, vien dai, vien da
van anh » tuan anh, van minh
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
ve cac » va cac
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang x hoi. hieu ((ve cac) OR (vien cac)) lo ((van anh) or (van thanh)) giau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang x hoi. hieu ((ve cac) OR (vien cac)) lo ((van anh) OR (van thanh)) giau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang x hoi. hieu ((ve cac) OR (vien cac)) lo ((van anh) or (van thanh)) giau cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang x hoi. hieu ((ve cac) OR (vien cac)) lo ((van anh) or (van thanh)) giau cua tre*.