Perhaps you should try some spelling variations:
sang tao » hang tai
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
sach ky » sach y, sach ty, sach kem
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
xuc va » duc va, tuc va, luc va
va cua » va chua, via cua, 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: su ((sach ky) or (sac ky)) sang tao hoi. ((hieu ve) or (hieu va)) cam xuc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) sang tao hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) sang tao hoi. ((hieu ve) or (hieu va)) cam xuc va hanh va cua tre*.