Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
van tai » von tai, van tuan
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
tuc va » thuc va, truc va, tuc xa
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach _ dang ((mai hoi) or (dai hoi)). hieu ve cam tuc va ((hanh tai) or (van tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach _ dang ((mai hoi) OR (dai hoi)). hieu ve cam tuc va ((hanh tai) OR (van tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach _ dang ((mai hoi) or (dai hoi)). hieu ve cam tuc va ((hanh tai) or (van tai)) cua tre*.