Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
cau treo » cau theo, cau tren, cau triet
mat hoi » mai hoi, mat troi, luat hoi
sat hoi » sat voi, luat hoi, sach hoi
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
ky dang » ky nang, ky danh
cuu tre » cua tre, cau tren
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky dang ((mat hoi) OR (sat hoi)). hieu ve cam xuc va hanh tai ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang ((mat hoi) OR (sat hoi)). hieu ve cam xuc va hanh tai ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang ((mat hoi) OR (sat hoi)). hieu ve cam xuc va hanh tai ((cuu tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang ((mat hoi) OR (sat hoi)). hieu ve cam xuc va hanh tai ((cuu tre) or (cau treo))*.