Perhaps you should try some spelling variations:
sach kem » hanh kem
sang tao » hang tai
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
hieu ve » hieu van
tao hoi » tao khoi, tao boi, tay hoi
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach kem) or (sac ky)) sang tao hoi. ((hieu ve) or (hieu va)) cam tuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach kem) OR (sac ky)) sang tao hoi. ((hieu ve) OR (hieu va)) cam tuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach kem) or (sac ky)) sang tao hoi. ((hieu ve) or (hieu va)) cam tuc va hanh vi cua tre*.