Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
va trien » va truyen, va thiet, va tuyen
sang ma » nang ma, sang tao, mang may
hieu va » lieu va, hieu qua
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
sach ty » sach y, sach tu, sach thu
cao xuc » cam xuc, cao duc, cao suc
tang ma » mang may, tang van
xuc va » duc va, tuc va, luc va
cua te » cua tu
va cao » va cac, va co, va dao

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: doc sach ty ((sang ma) OR (tang ma)) hoi. hieu va cao xuc va danh vi ((cua te) OR (va trien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ty ((sang ma) OR (tang ma)) hoi. hieu va cao xuc va danh vi ((cua te) or (va trien))~".
• Adding a wildcard symbol may retrieve word variants: doc sach ty ((sang ma) OR (tang ma)) hoi. hieu va cao xuc va danh vi ((cua te) or (va trien))*.