Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
dang mai » dang hai, dang mau, dang bai
va thanh » gia thanh, ban thanh, va tinh
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky dang » ky nang, ky danh
ve cam » ve cham, ve cac, va cam
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) OR (hoc sinh)) ky dang mai hoi. hieu ve cam xuc va thanh ((vai cua) or (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc sinh)) ky dang mai hoi. hieu ve cam xuc va thanh ((vai cua) OR (lai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc sinh)) ky dang mai hoi. hieu ve cam xuc va thanh ((vai cua) or (lai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) OR (hoc sinh)) ky dang mai hoi. hieu ve cam xuc va thanh ((vai cua) or (lai cua)) tre*.