Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
xu lang » cu lang, xu dang, xu quang
tu lang » cu lang, tu lanh, tu quang
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: tu sach ((tu lang) OR (xu lang)) xa hoi. hieu ve cac xuc ((va hanh) or (ban hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu lang) OR (xu lang)) xa hoi. hieu ve cac xuc ((va hanh) OR (ban hanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu lang) OR (xu lang)) xa hoi. hieu ve cac xuc ((va hanh) or (ban hanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu lang) OR (xu lang)) xa hoi. hieu ve cac xuc ((va hanh) or (ban hanh)) vai cua tre*.