Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hang di » hang doi, hang vi, hang dien
y nang » ky nang, ly nang, v nang
bac va » ban va, bac ha, bao 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. ((hieu van) OR (hieu va)) cam ((bac va) OR (tuc va)) hang di cua vat~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((hieu van) OR (hieu va)) cam ((bac va) OR (tuc va)) hang di cua vat*.