Perhaps you should try some spelling variations:
danh dai » danh dau, danh di, danh sai
tu sach » thu sach, su sach, te sach
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
cac lop » cac hop, cac loai
va danh » va dinh, va dan, va hanh
ve cac » va cac, vien cac
lop va » lap va, hop va, nop va
cua te » cua tu

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 y ((sang ma) or (mang may)) hoi. hieu ve cac lop va danh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((sang ma) OR (mang may)) hoi. hieu ve cac lop va danh dai cua te*.