Perhaps you should try some spelling variations:
sang dai » sang tai, lang dai, sang mai
hanh vai » hanh va, hanh tai, hanh van
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
ky sang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo
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: ((tu sach) OR (thu sach)) ky sang dai hoi. hieu ve cam xuc va ((hanh vai) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky sang dai hoi. hieu ve cam xuc va ((hanh vai) OR (hanh vi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky sang dai hoi. hieu ve cam xuc va ((hanh vai) or (hanh vi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky sang dai hoi. hieu ve cam xuc va ((hanh vai) or (hanh vi)) cuu tre*.