Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
tang ma » mang may, tang van
sang ma » nang ma, sang tao, mang may
va cam » va cham, va cac, va cao
luc 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: su sach ky ((sang ma) OR (tang ma)) hoi. hieu va cam ((luc va) OR (duc va)) thanh vi cua vat~.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((sang ma) or (tang ma)) hoi. hieu va cam ((luc va) or (duc va)) thanh vi cua vat*.