Perhaps you should try some spelling variations:
hinh thai » sinh thai, tinh thai, dinh thi
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tang ho » tang cho, tung ho, tang ha
nang ho » nang hoc, nang co, nang cao
ve cac » va cac, vien cac

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 ho) OR (tang ho)) hai. hieu ve cac xuc van ((hanh tai) or (hinh thai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ho) OR (tang ho)) hai. hieu ve cac xuc van ((hanh tai) OR (hinh thai)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang ho) OR (tang ho)) hai. hieu ve cac xuc van ((hanh tai) or (hinh thai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ho) OR (tang ho)) hai. hieu ve cac xuc van ((hanh tai) or (hinh thai)) cuu tre*.