Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
danh vai » danh sai, danh va, doanh van
nang dai » nang dau, nang tai, lang dai
cam thuc » am thuc, nam thuc, can thuc
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
cam thu » nam thu, cac thu, ca thu
so sach » bo sach, co sach, hoc sach
dai moi » doi moi, dai hoi
da nang » cam nang, kha nang, cao nang
so sanh » do sanh
hieu ve » hieu va, hieu van

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) or (so sanh)) da nang dai moi. hieu ve ((cam thuc) or (cam thu)) va danh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) da nang dai moi. hieu ve ((cam thuc) OR (cam thu)) va danh vai cua viet.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) da nang dai moi. hieu ve ((cam thuc) or (cam thu)) va danh vai cua viet*.