Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach thu, xach tay
cua tre » cua te, cua triet, dua tren
xuc van » duc van, luc van, xuc ban
sach tu » sach thu, cach tu, sach uu
cuu tre » cau tren, cau treo
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
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: te ((sach ty) or (sach tu)) nang o hoi. lieu va cam xuc van hanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach tu)) nang o hoi. lieu va cam xuc van hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach tu)) nang o hoi. lieu va cam xuc van hanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach tu)) nang o hoi. lieu va cam xuc van hanh vi ((cua tre) OR (cuu tre))*.