Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
danh dai » danh dau, danh di, danh sai
ly nang » ky nang, ly hang, ly vang
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang

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