Perhaps you should try some spelling variations:
cham luc » nhan luc, cham cuu, chat lua
vanh dai » van dai, vanh tai, lanh dao
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va vanh » va van, va danh, va hanh
nang o » nang co, nang ho, nang ro
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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang o hoi. hieu qua ((cham luc) OR (cham soc)) va vanh dai cua te~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang o hoi. hieu qua ((cham luc) OR (cham soc)) va vanh dai cua te*.