Perhaps you should try some spelling variations:
tinh vinh » tinh ninh, tinh binh, tinh hinh
cua viet » ca viet, hoa viet, cua vat
vinh cua » sinh cua, tinh cua, dinh cua
va tinh » may tinh
tu sach » thu sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
nang o » nang co, nang ho, nang ro
va nay » va ngay, va cay
xua va » xuat va, vua va, sua va
va nam » van nam, ha nam
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: ((tu sach) or (su sach)) ty nang o hoi. lieu ((va nam) or (va nay)) xua va tinh vinh cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang o hoi. lieu ((va nam) OR (va nay)) xua va tinh vinh cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ty nang o hoi. lieu ((va nam) or (va nay)) xua va tinh vinh cua viet*.