Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ly nang » ky nang, ly hang, ly vang
van cau » van dau, van hau, van chat
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
tuc va » thuc va, truc va, duc va
x hoi » xa hoi, o hoi, x ho
bach » sach, cach, bac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach ly nang x hoi. hieu van cau ((tuc va) or (tuc xa)) hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ly nang x hoi. hieu van cau ((tuc va) OR (tuc xa)) hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: vu bach ly nang x hoi. hieu van cau ((tuc va) or (tuc xa)) hanh vi ((cua tre) or (cuu tre))*.