Perhaps you should try some spelling variations:
cai viet » mai viet, tai viet, ca viet
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
me hoi » le hoi
va cai » va cac, va bai, va dai
ve nam » he nam, va nam, le nam

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 ky dang ((me hoi) or (ma hoa)). hieu ve nam thuc ((van hanh) or (ban hanh)) va cai viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky dang ((me hoi) OR (ma hoa)). hieu ve nam thuc ((van hanh) OR (ban hanh)) va cai viet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky dang ((me hoi) or (ma hoa)). hieu ve nam thuc ((van hanh) or (ban hanh)) va cai viet*.