Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
mai khoi » mai khoa, tai khoa, cac khoi
ky dang » ky nang
ky danh » ky anh
va tinh » may tinh
bai cua » ban cua, dai cua, bai ca
lai cua » dai cua, hai cua, lai chau
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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