Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh doi » thanh doi, hanh noi, hang doi
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
truc va » thuc va, thuc vat, trung va
doi cua » dai cua, hoi cua
y nang » ky nang, ly nang, v nang
xuc va » tuc va, luc va, xac va
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 (duc va))) or (truc va)) hanh 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 (duc va))) OR (truc va)) hanh doi cua vat.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu van cam ((((xuc va) or (duc va))) or (truc va)) hanh doi cua vat*.