Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
va cam » va cham, va cac, va cao
nang o » nang co, nang ho, nang ro
y nang » ky nang, ly nang, v nang
va dau » va dao
o hoi » co hoi, o hoc, o hai

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 y nang o hoi. hieu va cam xuc ((va doanh) or (va dau)) ((vi luu) or (vi lua)) truc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang o hoi. hieu va cam xuc ((va doanh) OR (va dau)) ((vi luu) OR (vi lua)) truc.
• Adding a wildcard symbol may retrieve word variants: su sach y nang o hoi. hieu va cam xuc ((va doanh) or (va dau)) ((vi luu) or (vi lua)) truc*.