Perhaps you should try some spelling variations:
sang dai » sang tai, lang dai, sang mai
hanh vai » hanh va, hanh tai, hanh van
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky
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 ky) OR (sac 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 ky) OR (sac 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 ky) OR (sac 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 ky) OR (sac ky)) sang dai hoi. hieu ve cam xuc va ((hanh vai) or (hanh vi)) cuu tre*.