Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
bach y » sach y
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
nang o » nang co, nang ho, nang ro
tuc va » thuc va, truc va, duc va
o hoi » co hoi, o hoc, o hai

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 o hoi. hieu ve cam ((tuc va) or (tuc xa)) hanh vi ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach y nang o hoi. hieu ve cam ((tuc va) OR (tuc xa)) hanh vi ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: vu bach y nang o hoi. hieu ve cam ((tuc va) or (tuc xa)) hanh vi ((cua tre) or (cau treo))*.