Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
doi cua » dai cua, hoi cua, dong cua
y nang » ky nang, ly nang, v nang
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
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: su sach y nang x hoi. hieu van cam ((xuc va) or (tuc va)) hanh ((di cua) or (doi cua)) vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu van cam ((xuc va) OR (tuc va)) hanh ((di cua) OR (doi cua)) vat.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu van cam ((xuc va) or (tuc va)) hanh ((di cua) or (doi cua)) vat*.