Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, le thanh
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
va hanh » van hanh, va danh, ban hanh
va tinh » may tinh
dai cuu » dai cua, dai huu
cuu tre » cua tre, cau tren, cau treo
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: toc sach ky nang x hoi. hieu va pham duc ((va hanh) or (((va thanh) OR (va tinh)))) dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang x hoi. hieu va pham duc ((va hanh) OR (((va thanh) OR (va tinh)))) dai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang x hoi. hieu va pham duc ((va hanh) or (((va thanh) OR (va tinh)))) dai cuu tre*".