Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cam thuc » am thuc, nam thuc, cam thu
danh sai » dung sai, danh bat, danh dau
danh vai » danh va, doanh van, dang van
thuc va » thuc vat, thuc dan, thuc day
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
lai hoa » dai hoa, loai hoc
mai doi » moi doi, mai hoi, mai khoi
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ve cam » ve cham, ve cac, va cam

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 v nang ((mai doi) or (lai hoa)). hieu ve cam thuc va ((danh vai) OR (danh sai)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v nang ((mai doi) OR (lai hoa)). hieu ve cam thuc va ((danh vai) OR (danh sai)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach v nang ((mai doi) or (lai hoa)). hieu ve cam thuc va ((danh vai) OR (danh sai)) cua viet".
• Adding a wildcard symbol may retrieve word variants: so sach v nang ((mai doi) or (lai hoa)). hieu ve cam thuc va ((danh vai) OR (danh sai)) cua viet*.