Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
qua cham » qua hai, qua cac, va cham
hanh doi » thanh doi, hanh noi, hang doi
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
doi cuu » doi cua, doi cuoc
cuu tre » cua tre, cau tren, cau treo
luc va » duc va, tuc va, loc va
x hoi » xa hoi, o hoi, 5 hoi

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 ky) OR (sach ty)) nang ((x hoi) OR (x ho)). hieu qua cham luc va hanh doi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach ty)) nang ((x hoi) or (x ho)). hieu qua cham luc va hanh doi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach ty)) nang ((x hoi) or (x ho)). hieu qua cham luc va hanh doi cuu tre*.