Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
toc sach » hoc sach, doc sach, thuoc sach
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
vuc van » duc van, luc van, thuc van
hanh va » hang va, hanh vi
so sanh » do sanh
nam vuc » nam vung, nam thuc, nam duoc
nang o » nang co, nang ho, nang ro
va nam » van nam, ha nam, va nay
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: ((so sanh) or (toc sach)) ky nang o hoi. lieu va nam vuc van hanh va ((su triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sanh) OR (toc sach)) ky nang o hoi. lieu va nam vuc van hanh va ((su triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: ((so sanh) or (toc sach)) ky nang o hoi. lieu va nam vuc van hanh va ((su triet) or (va triet))*.