Perhaps you should try some spelling variations:
vinh cuu » dinh cuu, sinh cua, dinh cu
vu sach » vu bach, su sach, vu khach
sach vu » sach va, sach tu, sach uu
va hanh » van hanh, va thanh, va danh
vu nang » vuc nang, va nang, vu dang
va cam » va cham, va cac, va cao
va dao » ca dao
nang o » nang co, nang ho, nang ro
vi cuu » vi luu
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 vu nang o hoi. hieu ((va cam) or (va dao)) duc va hanh ((vi cuu) or (vinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach vu nang o hoi. hieu ((va cam) OR (va dao)) duc va hanh ((vi cuu) OR (vinh cuu)) tre.
• Adding a wildcard symbol may retrieve word variants: vu sach vu nang o hoi. hieu ((va cam) or (va dao)) duc va hanh ((vi cuu) or (vinh cuu)) tre*.