Perhaps you should try some spelling variations:
van nang » van quang, van ban, van dong
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nuoc cam » nuoc nam, nuoc cap, nuoc chau
su sach » so sach, vu sach
vu nang » vuc nang, va nang, vu dang
hieu va » lieu va, hieu qua
nang vi » hang vi, nang ji, nang si
vi cua » vai cua, di cua
cua te » cua tu
chuc » thuc, chu, chua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((((vu nang) or (chuc nang))) or (van nang)) xa hoi. hieu va cac nuoc cam nang vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((((vu nang) OR (chuc nang))) OR (van nang)) xa hoi. hieu va cac nuoc cam nang vi cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ((((vu nang) or (chuc nang))) or (van nang)) xa hoi. hieu va cac nuoc cam nang vi cua te*.