Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
bach y » sach y
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, duc va
vi cua » vai cua, di cua
x hoi » o hoi, x ho, 5 hoi

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 y nang ((x hoi) OR (xa hoi)). hieu ve cam ((tuc va) or (tuc xa)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach y nang ((x hoi) OR (xa hoi)). hieu ve cam ((tuc va) OR (tuc xa)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu bach y nang ((x hoi) OR (xa hoi)). hieu ve cam ((tuc va) or (tuc xa)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu bach y nang ((x hoi) OR (xa hoi)). hieu ve cam ((tuc va) or (tuc xa)) hanh vi cua tre*.