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, te sach, tu cach
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
tang ho » tang cho, tung ho, tang ha
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach
ho hai » hoc hai, pho hai, cho hai
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) OR (su sach)) ky 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) OR (su sach)) ky 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) OR (su sach)) ky tang ho hai. hieu ve cac xuc van ((hanh tai) or (hinh thai)) cuu tre*".