Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
ke cau » ket cau
ve cua » le cua, de cua, te cua
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu
y nang » ky nang, ly nang, may nang
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: toc sach ((y nang) OR (v nang)) o hoi. hieu ((le mau) OR (ke cau)) luc va hanh ve cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((y nang) OR (v nang)) o hoi. hieu ((le mau) or (ke cau)) luc va hanh ve cua tu~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) OR (v nang)) o hoi. hieu ((le mau) or (ke cau)) luc va hanh ve cua tu*.