Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dang xay » dang van
doi cua » dai cua, hoi cua
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
tac ban » tai ban, cac ban, tao ban
do cua » co cua, de cua, dong cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
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 sac ky ((dang xay) or (van xay)) hoi. hieu ve cac tac ban thanh ((do cua) or (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((dang xay) OR (van xay)) hoi. hieu ve cac tac ban thanh ((do cua) OR (doi cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((dang xay) or (van xay)) hoi. hieu ve cac tac ban thanh ((do cua) or (doi cua)) tre*.