Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
mao triet » va triet, bo triet, cau triet
tao thiet » tai thiet, tay thiet, toan thiet
van hanh » van thanh, ban hanh, van anh
hieu va » hieu qua
xuc van » duc van, luc van, vuc van
nang o » nang co, nang ho, nang ro
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
o hoi » co hoi, o hoc, o hai

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: thuoc sach v nang o hoi. ((hieu va) OR (lieu va)) cam xuc van hanh vi ((mao triet) OR (tao thiet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach v nang o hoi. ((hieu va) or (lieu va)) cam xuc van hanh vi ((mao triet) OR (tao thiet))~".
• Adding a wildcard symbol may retrieve word variants: thuoc sach v nang o hoi. ((hieu va) or (lieu va)) cam xuc van hanh vi ((mao triet) OR (tao thiet))*.