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

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