Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
va doanh » van doanh, va danh, hoa doanh
sach ky » sac ky, sach y, sach ty
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
sai ky » sac ky
va cua » va chua, via cua, ca cua
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sai ky)) lang xa hoi. hieu ve cau luc ((va doanh) or (vay doanh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sai ky)) lang xa hoi. hieu ve cau luc ((va doanh) OR (vay doanh)) va cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sai ky)) lang xa hoi. hieu ve cau luc ((va doanh) or (vay doanh)) va cua tre*.