Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham luc » cham soc, nhan luc, cham cuu
hanh doi » thanh doi, hanh noi, hang doi
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
y nang » ly nang, v nang, may nang
luc va » duc va, tuc va, loc va
cua te » cua tu
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: su sach ((y nang) OR (ky nang)) o hoi. hieu qua cham luc va hanh doi ((cau tren) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ky nang)) o hoi. hieu qua cham luc va hanh doi ((cau tren) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (ky nang)) o hoi. hieu qua cham luc va hanh doi ((cau tren) or (cua te))*.