Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
truc va » thuc va, thuc vat, trung va
y nang » ky nang, ly nang, v nang
tuc va » thuc va, tuc xa, thuc vat
vai va » mai va, dai va, hai va

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 xa hoi. hieu van cam ((((tuc va) or (duc va))) or (truc va)) hanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu van cam ((((tuc va) OR (duc va))) OR (truc va)) hanh vai va triet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu van cam ((((tuc va) or (duc va))) or (truc va)) hanh vai va triet*.