Perhaps you should try some spelling variations:
su sach » so sach, vu sach
va nang » van nang, da nang, cam nang
hieu va » lieu va, hieu qua
hang di » hang doi, hang vi, hang dien
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de 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: su sach ((y nang) or (va nang)) x hoi. hieu va cam ((xuc va) OR (tuc va)) hang di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (va nang)) x hoi. hieu va cam ((xuc va) OR (tuc va)) hang di cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (va nang)) x hoi. hieu va cam ((xuc va) OR (tuc va)) hang di cua vat".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (va nang)) x hoi. hieu va cam ((xuc va) OR (tuc va)) hang di cua vat*.