Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
qua cua » quan cua, quang cua, qua quan
cua cua » cua chua, ca cua, cua cha
cham lo » cham o, cam lo, cham soc
va cham » va chat, va tham
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((mang xa) or (nang ma)) hoi. hieu va cham lo va doanh ((cua cua) OR (qua cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((mang xa) OR (nang ma)) hoi. hieu va cham lo va doanh ((cua cua) OR (qua cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((mang xa) or (nang ma)) hoi. hieu va cham lo va doanh ((cua cua) OR (qua cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((mang xa) or (nang ma)) hoi. hieu va cham lo va doanh ((cua cua) OR (qua cua)) triet*.