Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
cac bac » cac bai, cac ban, cac cach
su sach » so sach, vu sach
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua
cac tu » cac thu, cach tu, cac du
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu bach) or (su sach)) ky lang ha hoi. hieu ve ((cac tu) or (cac bac)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu bach) OR (su sach)) ky lang ha hoi. hieu ve ((cac tu) OR (cac bac)) va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu bach) or (su sach)) ky lang ha hoi. hieu ve ((cac tu) or (cac bac)) va hanh vi cua tre*.