Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, cac nuoc, chat xuc
qua cac » cua cac
lang xa » dang xay, lang van
lang ha » long ha
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 y ((lang xa) OR (lang ha)) hoi. hieu qua cac xuc ((ban hanh) or (van thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((lang xa) OR (lang ha)) hoi. hieu qua cac xuc ((ban hanh) OR (van thanh)) vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((lang xa) OR (lang ha)) hoi. hieu qua cac xuc ((ban hanh) or (van thanh)) vi cua tre*".