Perhaps you should try some spelling variations:
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
bo sach » co sach, hoc sach
nang ho » nang hoc, nang co, tang ho
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
ho hoi » hoc hoi, hoa hoi, hoi hoi
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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 tru nang ho hoi. ((hieu ve) OR (lieu va)) pham duc va hanh vi cua tu~.
• Adding a wildcard symbol may retrieve word variants: bo sach tru nang ho hoi. ((hieu ve) or (lieu va)) pham duc va hanh vi cua tu*.