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