Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
lang ha » long ha
lang xa » dang xay, lang van
cua tre » cua te, cuu tre, cua triet

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 ty ((lang xa) OR (lang ha)) hoi. hieu va cac xuc ((van hanh) or (ban hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((lang xa) OR (lang ha)) hoi. hieu va cac xuc ((van hanh) OR (ban hanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((lang xa) OR (lang ha)) hoi. hieu va cac xuc ((van hanh) or (ban hanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((lang xa) OR (lang ha)) hoi. hieu va cac xuc ((van hanh) or (ban hanh)) vai cua tre*.