Perhaps you should try some spelling variations:
doanh cua » doanh luan
khoa tre » khoe tre, khoa tri, khoa dr
nhua tre » chua tri, cua tre, thuc tre
va doanh » van doanh, vay doanh, va danh
cac tuc » cac toc, cac tu, cac tac
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
sach v » sach va, sach y, sach 2
tuc va » thuc va, truc va, tuc xa
me hoi » le hoi
v nang » va nang, vu nang, van nang

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

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