Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
su sach » so sach, vu sach
cua cua » cua chua, qua cua, cua cha
cac tuc » cac toc, cac tu, cac tac
sach ly » sach y, sach lo, sach ty
hieu va » lieu va, hieu qua
ly nang » ky nang, ly hang, ly vang
tuc va » thuc va, truc va, tuc xa
me hoi » le hoi
ca cua » co cua

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 ly nang ((me hoi) or (ma hoa)). hieu va cac tuc va doanh ((cua cua) OR (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ((me hoi) OR (ma hoa)). hieu va cac tuc va doanh ((cua cua) OR (ca cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang ((me hoi) or (ma hoa)). hieu va cac tuc va doanh ((cua cua) OR (ca cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ((me hoi) or (ma hoa)). hieu va cac tuc va doanh ((cua cua) OR (ca cua)) tre*.