Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hanh te » hanh tu, hanh ve, hanh de
va hanh » van hanh, va thanh, va danh
cua duc » cua tuc, cua nuoc, cua quoc
ke cau » ket cau
nang o » nang co, nang ho, nang ro
loc va » hoc va, luc va
y nang » ky nang, ly nang, v nang
te cua » tue cua, le cua, de cua
ve cac » va cac, vien cac
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: ((toc sach) OR (hoc sach)) y nang o hoi. hieu ((ve cac) OR (ke cau)) loc va hanh te cua duc~.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) y nang o hoi. hieu ((ve cac) or (ke cau)) loc va hanh te cua duc*.