Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dang mai » dang hai, dang mau, dang bai
sach ky » sac ky, sach y, sach ty
hai cua » thai cua, dai cua, hoi cua
lai cua » dai cua, lai chau, thai cua
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky dang » ky nang, ky danh
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky dang mai hoi. hieu ve cam ((xuc va) OR (tuc va)) thanh ((lai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky dang mai hoi. hieu ve cam ((xuc va) OR (tuc va)) thanh ((lai cua) OR (hai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky dang mai hoi. hieu ve cam ((xuc va) OR (tuc va)) thanh ((lai cua) or (hai cua)) tre*".