Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
doi cua » dai cua, hoi cua
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
di cua » dai cua, de cua, do 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: tu sach y nang x hoi. hieu van cam ((xuc va) OR (luc va)) hanh ((di cua) or (doi cua)) vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu van cam ((xuc va) OR (luc va)) hanh ((di cua) OR (doi cua)) vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu van cam ((xuc va) OR (luc va)) hanh ((di cua) or (doi cua)) vat".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu van cam ((xuc va) OR (luc va)) hanh ((di cua) or (doi cua)) vat*.