Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
pham thu » pham thuc, pham thi, pham tu
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
thu va » thuc va, thue va, tu va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (toc sach)) ky nang xa hoi. hieu va pham thu va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (toc sach)) ky nang xa hoi. hieu va pham thu va hanh vi cua tre*.