Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dang mai » dang hai, dang mau, dang bai
va thanh » gia thanh, ban thanh, va tinh
ve cham » va cham, ve chat, vu cham
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ky dang » ky nang, ky danh
xuc va » duc va, tuc va, luc va
ve cam » ve cac, va cam, ve cai

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) OR (ve cham)) xuc va thanh ((vai cua) or (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky dang mai hoi. hieu ((ve cam) OR (ve cham)) xuc va thanh ((vai cua) OR (lai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky dang mai hoi. hieu ((ve cam) OR (ve cham)) xuc va thanh ((vai cua) or (lai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky dang mai hoi. hieu ((ve cam) OR (ve cham)) xuc va thanh ((vai cua) or (lai cua)) tre*.