Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hanh tai, anh thai
hinh thai » sinh thai, tinh thai, dinh thi
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
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 cac » va cac, vien cac
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 cac ((xuc van) or (duc tan)) ((hanh thai) OR (hinh thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang o hai. hieu ve cac ((xuc van) OR (duc tan)) ((hanh thai) OR (hinh thai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang o hai. hieu ve cac ((xuc van) or (duc tan)) ((hanh thai) OR (hinh thai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach y nang o hai. hieu ve cac ((xuc van) or (duc tan)) ((hanh thai) OR (hinh thai)) cua tre*.