Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
ve cam » ve cham, ve cac, va cam
o hai » co hai, so hai, o lai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang o hai. hieu ve cam ((xuc van) or (duc van)) hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang o hai. hieu ve cam ((xuc van) OR (duc van)) hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach y nang o hai. hieu ve cam ((xuc van) or (duc van)) hanh thai cua tre*.