Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
o hoc » co hoc, mo hoc, so hoc
vi va » vi van, vai va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang ((xa hoi) or (o hoc)). hieu ve ((nam thuc) or (cam xuc)) van hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((xa hoi) OR (o hoc)). hieu ve ((nam thuc) OR (cam xuc)) van hanh vi va triet.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((xa hoi) or (o hoc)). hieu ve ((nam thuc) or (cam xuc)) van hanh vi va triet*.