Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
oi su » vi su
ki su » ky su

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: tu sach _ sang ma hoi. hieu va cam ((xuc van) OR (duc tan)) thanh ((oi su) OR (ki su)) triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach _ sang ma hoi. hieu va cam ((xuc van) or (duc tan)) thanh ((oi su) or (ki su)) triet*.