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
dong cua » dung cua, cong cua, huong cua
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tri nang ((x hoi) OR (o hoi)). hieu ve cam xuc van hanh ((vi cua) or (dong cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tri nang ((x hoi) OR (o hoi)). hieu ve cam xuc van hanh ((vi cua) OR (dong cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tri nang ((x hoi) OR (o hoi)). hieu ve cam xuc van hanh ((vi cua) or (dong cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach tri nang ((x hoi) OR (o hoi)). hieu ve cam xuc van hanh ((vi cua) or (dong cua)) triet*.