Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
nhan luc » nang luc
cham luc » cham soc, cham cuu, chat lua
va vanh » va van, va danh, va hanh
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang o hoi. hieu qua ((cham luc) OR (nhan luc)) va vanh dai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach ty)) nang o hoi. hieu qua ((cham luc) OR (nhan luc)) va vanh dai cua te~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) nang o hoi. hieu qua ((cham luc) OR (nhan luc)) va vanh dai cua te*.