Perhaps you should try some spelling variations:
sach tri » sach tai, sach tren, sach truc
tri nang » thi nang, tra nang, tri bang
van hanh » van thanh, ban hanh, van anh
doi cua » dai cua, hoi cua
xuc van » duc van, luc van, vuc van
su sach » so sach, vu sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
di cua » dai cua, de cua, do cua
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: su sach tri nang x hoi. ((hieu ve) OR (hieu va)) cam xuc van hanh ((di cua) OR (doi cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tri nang x hoi. ((hieu ve) OR (hieu va)) cam xuc van hanh ((di cua) or (doi cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: su sach tri nang x hoi. ((hieu ve) OR (hieu va)) cam xuc van hanh ((di cua) or (doi cua)) triet*.