Perhaps you should try some spelling variations:
toc sac » toc sach, toc san, hoc sach
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va dinh » van dinh, va kinh, va tinh
dinh du » dinh duc, dinh cu, dinh tu
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
du cuu » tu cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky nang ((ma hoi) or (xa hoi)). hieu va cam tuc va dinh du cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky nang ((ma hoi) OR (xa hoi)). hieu va cam tuc va dinh du cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sac ky nang ((ma hoi) or (xa hoi)). hieu va cam tuc va dinh du cuu tre*.