Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
dinh thi » dinh tri
hanh tai » thanh tai, hang tai, han tai
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach
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
xuc van » duc van, luc van, vuc van
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 (dinh thi)) ((cuu tre) OR (cau tren))~.
• 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 (dinh thi)) ((cuu tre) OR (cau tren))*.
• 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 (dinh thi)) ((cuu tre) OR (cau tren))*".