Perhaps you should try some spelling variations:
vinh cuu » dinh cuu, sinh cua, dinh cu
so sach » so sanh, bo sach, co sach
va danh » va dinh, va dan, va hanh
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
va cam » va cham, va cao, va cai
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: so sach y nang o hoi. hieu ((va cam) or (va cac)) duc va danh ((vi cuu) or (vinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang o hoi. hieu ((va cam) OR (va cac)) duc va danh ((vi cuu) OR (vinh cuu)) tre.
• Adding a wildcard symbol may retrieve word variants: so sach y nang o hoi. hieu ((va cam) or (va cac)) duc va danh ((vi cuu) or (vinh cuu)) tre*.