Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
danh vai » danh sai, danh va, doanh van
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
cac lao » cac loai, cac giao, cac lang
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
ca lao » cua lao, ca dao, ca cao
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((y nang) or (ky nang)) ma hoi. hieu ve ((cac lao) or (ca lao)) va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((y nang) OR (ky nang)) ma hoi. hieu ve ((cac lao) OR (ca lao)) va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ((y nang) or (ky nang)) ma hoi. hieu ve ((cac lao) or (ca lao)) va danh vai cua tre*.