Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
vien chat » van chat, vien cac, vien cao
hieu vien » hieu hien, hieu viec, thieu nien
chat xuc » chat huu, cam xuc, chao xu
cao hoc » co hoc, cho hoc, chat hoc
cao hoi » cau hoi, co hoi, tao hoi
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua tre » cua te, cuu tre, cua triet
du cua » duy cua, dau cua, dum cua

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 ((cao hoi) or (cao hoc)). hieu vien chat xuc ((va danh) OR (va hanh)) du cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang ((cao hoi) OR (cao hoc)). hieu vien chat xuc ((va danh) OR (va hanh)) du cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang ((cao hoi) or (cao hoc)). hieu vien chat xuc ((va danh) OR (va hanh)) du cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang ((cao hoi) or (cao hoc)). hieu vien chat xuc ((va danh) OR (va hanh)) du cua tre*.