Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh vai » hanh vi, hanh va, hanh tai
mai khoi » mai khoa, tai khoa, cac khoi
ky sang » ky nang, ky dang, duy sang
ky tang » ky nang, ky dang, kho tang
bo sach » co sach, hoc sach
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
vai cau » va cau, van cau, vai cac
so sach » so sanh, co sach, hoc sach
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: ((so sach) OR (bo sach)) ((ky sang) or (ky tang)) mai khoi. hieu ve cam xuc va hanh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) ((ky sang) OR (ky tang)) mai khoi. hieu ve cam xuc va hanh vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (bo sach)) ((ky sang) or (ky tang)) mai khoi. hieu ve cam xuc va hanh vai cau tren".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (bo sach)) ((ky sang) or (ky tang)) mai khoi. hieu ve cam xuc va hanh vai cau tren*.