Perhaps you should try some spelling variations:
sach ky » sach y, sach ty, sach kem
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
vi cuu » vi luu, vinh cuu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) ((nang x) OR (nang ma)) hoi. hieu ve cac xuc va hanh vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) ((nang x) or (nang ma)) hoi. hieu ve cac xuc va hanh vi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) ((nang x) or (nang ma)) hoi. hieu ve cac xuc va hanh vi cuu tre*.