Perhaps you should try some spelling variations:
hai truc » dai truc, hai trac, hang truc
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
so sach » so sanh, bo sach, co sach
qua hai » qua hoat
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
va hanh » van hanh, va danh, ban hanh
vi cua » vai cua, di cua
de cua » le cua, te cua, dieu cua

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: so sach ky dang xa hoi. hieu qua hai truc ((va hanh) OR (va thanh)) ((vi cua) OR (de cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky dang xa hoi. hieu qua hai truc ((va hanh) OR (va thanh)) ((vi cua) or (de cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: so sach ky dang xa hoi. hieu qua hai truc ((va hanh) OR (va thanh)) ((vi cua) or (de cua)) triet*.