Perhaps you should try some spelling variations:
ban thanh » ban hang
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
dang xay » dang van, van xay
nam xuc » cam xuc, nam xua, nam thuc
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, lang van
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((lang xa) or (dang xay)) hoi. hieu van nam xuc ((ban thanh) or (ban hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((lang xa) OR (dang xay)) hoi. hieu van nam xuc ((ban thanh) OR (ban hanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((lang xa) or (dang xay)) hoi. hieu van nam xuc ((ban thanh) or (ban hanh)) vi cua tre*.