Perhaps you should try some spelling variations:
hai truc » dai truc, hai trac, hang truc
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
qua hai » qua hoat
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
doi cua » dai cua, hoi cua
vi cua » vai cua
di cua » dai cua, de cua, do 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 ((vi cua) OR (((di cua) OR (doi 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 ((vi cua) or (((di cua) OR (doi cua)))) triet~".
• Adding a wildcard symbol may retrieve word variants: so sach ky dang xa hoi. hieu qua hai truc va hanh ((vi cua) or (((di cua) OR (doi cua)))) triet*.