Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
anh vi » hanh vi, anh ve, anh vu
anh va » hanh va
nang o » nang co, nang ho, nang ro
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: tu sach ky nang o hoi. hieu van cam xuc ban ((anh vi) or (anh va)) ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hoi. hieu van cam xuc ban ((anh vi) OR (anh va)) ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. hieu van cam xuc ban ((anh vi) or (anh va)) ((cua tre) or (cau tren))*.