Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
luc ngan » luc nganh, luc nhan, luat ngan
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
hang vi » hang va, hanh vi, hang di
va cau » van cau, va cac, va dau
vi cau » ve cau, di cau, viet cau
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ((x hoi) OR (o hoi)). hieu va cau luc ngan hang vi cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((x hoi) OR (o hoi)). hieu va cau luc ngan hang vi cau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((x hoi) OR (o hoi)). hieu va cau luc ngan hang vi cau tren*.