Perhaps you should try some spelling variations:
dang xay » dang van, van xay
bo sach » co sach, hoc sach
hoc cac » hoc cao
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
qua hai » qua hoat
hai cuc » tai cuc, hai cua, thai cua
va hanh » van hanh, va thanh, va danh
cuc va » chuc va, duc va, cuu va
vi su » ve su, ki su, oi su

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: ((bo sach) OR (hoc cac)) ky dang xay hoi. hieu qua hai cuc va hanh ((vi su) OR (va su)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bo sach) or (hoc cac)) ky dang xay hoi. hieu qua hai cuc va hanh ((vi su) OR (va su)) triet~".
• Adding a wildcard symbol may retrieve word variants: ((bo sach) or (hoc cac)) ky dang xay hoi. hieu qua hai cuc va hanh ((vi su) OR (va su)) triet*.