Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
van hanh » van thanh, ban hanh, van anh
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
cac xuc » cam xuc, cac nuoc, chat xuc
va danh » va dinh, va dan, va hanh
cuu tre » cua tre, cau tren, cau treo
tu cai » tu can, tu bai, tu cay
ma hoi » mai hoi, xa hoi, ma hoa
ca cuu » cap cuu, cua cuu, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cai) or (tu cac)) ky tang ma hoi. hieu cua cac xuc ((va danh) or (van hanh)) ca cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cai) OR (tu cac)) ky tang ma hoi. hieu cua cac xuc ((va danh) OR (van hanh)) ca cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cai) or (tu cac)) ky tang ma hoi. hieu cua cac xuc ((va danh) or (van hanh)) ca cuu tre*.