Perhaps you should try some spelling variations:
ban hanh » ban hang
dang xay » dang van, van xay
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
luc ban » duc ban, cuc ban, luc bat
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
lang xa » lang ha, lang van
bai ky » ban ky, sai ky, bac ky
ve cau » ke cau, va cau, ve cac
te bai » te bao, te tai, te ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: te bai ky ((lang xa) OR (dang xay)) hoi. hieu ve cau luc ban hanh kem ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te bai ky ((lang xa) OR (dang xay)) hoi. hieu ve cau luc ban hanh kem ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te bai ky ((lang xa) OR (dang xay)) hoi. hieu ve cau luc ban hanh kem ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te bai ky ((lang xa) OR (dang xay)) hoi. hieu ve cau luc ban hanh kem ((cua tre) or (cuu tre))*.