Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
su sach » so sach, vu sach
truc va » thuc va, thuc vat, trung va
luy tre » luyen tre
y nang » ky nang, ly nang, v nang
tuc va » thuc va, tuc xa, duc 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 cham ((tuc va) or (truc va)) hanh vi ((luy tre) or (luu tru))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu van cham ((tuc va) OR (truc va)) hanh vi ((luy tre) OR (luu tru)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu van cham ((tuc va) or (truc va)) hanh vi ((luy tre) or (luu tru))*.