Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
tinh he » trinh he, hinh he, tinh ha
tinh de » tinh da, sinh de, minh de
sach ky » sac ky, sach y, sach ty
va cam » va cham, va cac, va cao
ve cai » va cai, ve cac, ve tai
ma hoi » mai hoi, xa hoi, ma hoa

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: vu sach ky tang ma hoi. hieu ((ve cai) OR (va cam)) duc va ((tinh de) OR (tinh he)) cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky tang ma hoi. hieu ((ve cai) or (va cam)) duc va ((tinh de) OR (tinh he)) cua vat~".
• Adding a wildcard symbol may retrieve word variants: vu sach ky tang ma hoi. hieu ((ve cai) or (va cam)) duc va ((tinh de) OR (tinh he)) cua vat*.