Perhaps you should try some spelling variations:
tao khoi » tao hoi, thao khoa, lao khoa
su sach » so sach, vu sach
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, duy sang
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet
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 sang) OR (ky tang)) tao khoi. ((hieu ve) or (lieu va)) cam xuc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky sang) OR (ky tang)) tao khoi. ((hieu ve) OR (lieu va)) cam xuc va hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky sang) OR (ky tang)) tao khoi. ((hieu ve) or (lieu va)) cam xuc va hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky sang) OR (ky tang)) tao khoi. ((hieu ve) or (lieu va)) cam xuc va hanh va cua tre*.