Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
hieu ve » hieu van
xuc va » duc va, tuc va, luc va
nang o » nang co, nang ho, nang ro
lam va » nam va, lam ha, am va
dam va » dam van, nam va, dam ha
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: vu sach ky nang o hoi. ((hieu ve) or (hieu va)) cam xuc va thanh ((lam va) OR (dam va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang o hoi. ((hieu ve) OR (hieu va)) cam xuc va thanh ((lam va) OR (dam va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang o hoi. ((hieu ve) or (hieu va)) cam xuc va thanh ((lam va) OR (dam va)) triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang o hoi. ((hieu ve) or (hieu va)) cam xuc va thanh ((lam va) OR (dam va)) triet*.