Perhaps you should try some spelling variations:
sach ky » sach y, sach kem, sach hay
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
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) or (sach ty))) or (sac ky)) nang o hoi. hieu ve cam xuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach ky) OR (sach ty))) OR (sac ky)) nang o hoi. hieu ve cam xuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((((sach ky) or (sach ty))) or (sac ky)) nang o hoi. hieu ve cam xuc va hanh vi cua tre*.