Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
hanh hai » thanh hai, nhanh hai, hang hai
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
cuu tre » cau tren, cau treo
xuc va » duc va, tuc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa

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 ty) or (sach thieu)) nang ma hoi. hieu cua cac xuc va hanh hai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thieu)) nang ma hoi. hieu cua cac xuc va hanh hai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thieu)) nang ma hoi. hieu cua cac xuc va hanh hai ((cua tre) or (cuu tre))*.