Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
vang cua » mang cua, hang cua, tang cua
dang xay » dang van, van xay
va doanh » van doanh, va danh, hoa doanh
toc sac » toc sach, toc san, hoc sach
cac tuc » cac toc, cac tu, cac tac
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lang xa » lang ha, lang van
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: toc sac ky ((lang xa) OR (dang xay)) hoi. hieu ve cac tuc ((va doanh) or (vay doanh)) vang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky ((lang xa) OR (dang xay)) hoi. hieu ve cac tuc ((va doanh) OR (vay doanh)) vang cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky ((lang xa) OR (dang xay)) hoi. hieu ve cac tuc ((va doanh) or (vay doanh)) vang cua tre*".