Perhaps you should try some spelling variations:
sang tay » sang tao, sang tai, sang tac
te sach » toc sach
va danh » va dinh, va dan, dia danh
ty sang » ty xang, ty hang, duy sang
tay hoi » tay ho, tao hoi, tay thai
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, ban hanh
sach ty » sach y, sach tu, sach thu
cam luc » cam xuc, cau luc
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 ty sang tay hoi. ((hieu ve) OR (hieu qua)) cam luc ((va danh) OR (va hanh)) vi cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty sang tay hoi. ((hieu ve) or (hieu qua)) cam luc ((va danh) OR (va hanh)) vi cua vat~".
• Adding a wildcard symbol may retrieve word variants: te sach ty sang tay hoi. ((hieu ve) or (hieu qua)) cam luc ((va danh) OR (va hanh)) vi cua vat*.