Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
su sach » so sach, vu sach
cac xuc » cam xuc, cac nuoc, chat xuc
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang ho » nang hoc, nang co, tang ho
nang o » nang co, nang ro, nang x
ve cac » va cac, vien cac

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 ky ((nang o) or (nang ho)) hoi. hieu ve cac xuc ((van hanh) OR (ban hanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang o) OR (nang ho)) hoi. hieu ve cac xuc ((van hanh) OR (ban hanh)) tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang o) or (nang ho)) hoi. hieu ve cac xuc ((van hanh) OR (ban hanh)) tai cua tre*".