Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
co sach » bo sach, cuon sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu
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: ((su sach) or (((co sach) OR (hoc sach)))) ky nang x hoi. hieu va cam tu va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (((co sach) OR (hoc sach)))) ky nang x hoi. hieu va cam tu va hanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (((co sach) OR (hoc sach)))) ky nang x hoi. hieu va cam tu va hanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (((co sach) OR (hoc sach)))) ky nang x hoi. hieu va cam tu va hanh vai cuu tre*.