Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
su sach » so sach, vu sach
tai cua » thai cua, tai cuc, tri cua
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
luc va » duc va, tuc va, loc va
cua te » cua tu

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 ((nang xa) or (nang ma)) hoi. hieu ((va cham) or (va cac)) luc va doanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (nang ma)) hoi. hieu ((va cham) OR (va cac)) luc va doanh tai cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (nang ma)) hoi. hieu ((va cham) or (va cac)) luc va doanh tai cua te*.