Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
qua coc » qua cac, qua co, qua con
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cuu tre » cua tre, cau tren, cau treo
di cuu » di cau, di cua, dinh cuu
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky nang x hoi. hieu qua coc luc ((va danh) OR (va hanh)) di cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu hoach)) ky nang x hoi. hieu qua coc luc ((va danh) OR (va hanh)) di cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky nang x hoi. hieu qua coc luc ((va danh) OR (va hanh)) di cuu tre*.