Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sang tao » hang tai
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cam luc » cam xuc, cau luc
hieu ve » hieu va, hieu van
tao hoi » tao khoi, tao boi, tay hoi
ky sang » ky nang, ky dang, ky tang
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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: ((te sach) OR (toc sach)) ky sang tao hoi. ((hieu ve) OR (hieu qua)) cam luc va danh vi cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky sang tao hoi. ((hieu ve) or (hieu qua)) cam luc va danh vi cua vat~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky sang tao hoi. ((hieu ve) or (hieu qua)) cam luc va danh vi cua vat*.