Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
van nang » van quang, van ban, van dong
va triet » va thiet, va trien, ve triet
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem
luc va » duc va, tuc va, loc va
de va » de van, te va, ke va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (hoc sach)) van nang xa hoi. hieu va cac luc va hanh de va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) van nang xa hoi. hieu va cac luc va hanh de va triet.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) van nang xa hoi. hieu va cac luc va hanh de va triet*.