Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nhan luc » nang luc
luc tuan » luc luan, luc quan, luu tuan
viet cua » viec cua, viet ca, viet qua
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va nhan » van nhan, ca nhan, va phan
nang o » nang co, nang ho, nang ro
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: ((tu sach) or (toc sach)) ky nang o hoi. hieu va nhan luc tuan anh viet cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky nang o hoi. hieu va nhan luc tuan anh viet cua vat.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky nang o hoi. hieu va nhan luc tuan anh viet cua vat*.