Perhaps you should try some spelling variations:
sach dao » lanh dao
hanh tai » thanh tai, hang tai, han tai
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
hang ca » hang va, nang cao, hang tai
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
ca hoi » cau hoi, cua hoi, xa hoi
ve cam » ve cham, va cam, ve cai

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 y) or (sach dao)) hang ca hoi. hieu ((ve cam) or (ve cac)) xuc va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (sach dao)) hang ca hoi. hieu ((ve cam) OR (ve cac)) xuc va hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (sach dao)) hang ca hoi. hieu ((ve cam) or (ve cac)) xuc va hanh tai cua tre*.