Perhaps you should try some spelling variations:
te sach » toc sach
vu nang » vuc nang, va nang, vu dang
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
v nang » va nang, van nang, voi nang
cua te » cua tu
cua su » qua su
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 ((v nang) or (vu nang)) x hoi. hieu va cac duc va danh di ((cua te) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((v nang) OR (vu nang)) x hoi. hieu va cac duc va danh di ((cua te) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: te sach ((v nang) or (vu nang)) x hoi. hieu va cac duc va danh di ((cua te) or (cua su))*.