Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hanh le » thanh le, hanh ve, hanh de
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
ly nang » ky nang, ly hang, ly vang
va nang » van nang, da nang, cam nang
va cam » va cham, va cac, va cao
le cua » ly cua
x hoi » xa hoi, o hoi, x ho

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) or (toc sach)) ((va nang) or (ly nang)) x hoi. hieu va cam xuc van hanh le cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((va nang) OR (ly nang)) x hoi. hieu va cam xuc van hanh le cua vat.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ((va nang) or (ly nang)) x hoi. hieu va cam xuc van hanh le cua vat*.