Perhaps you should try some spelling variations:
toc sac » toc sach, toc san, hoc sach
duc cuu » duc suu
va kinh » va tinh, qua kinh
va dinh » van dinh, va tinh, vu dinh
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
mang xa » lang xa, mang may, dang xay
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao

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 ((mang xa) or (nang ma)) hoi. hieu va cam luc ((va dinh) or (va kinh)) duc cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky ((mang xa) OR (nang ma)) hoi. hieu va cam luc ((va dinh) OR (va kinh)) duc cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sac ky ((mang xa) or (nang ma)) hoi. hieu va cam luc ((va dinh) or (va kinh)) duc cuu tre*.