Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
tinh thai » sinh thai, tinh toan, tinh chat
hinh thai » sinh thai, dinh thi, chinh tai
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
xuc van » duc van, luc van, xuc ban
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
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: tu sach ky nang o hai. hieu ve cac xuc van ((nhanh thai) or (((hinh thai) OR (tinh thai)))) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hai. hieu ve cac xuc van ((nhanh thai) OR (((hinh thai) OR (tinh thai)))) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang o hai. hieu ve cac xuc van ((nhanh thai) or (((hinh thai) OR (tinh thai)))) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hai. hieu ve cac xuc van ((nhanh thai) or (((hinh thai) OR (tinh thai)))) cua tre*.