Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
duc van » duc tan, duc manh, duc phan
anh dai » vanh dai, anh bai, anh dat
co hoi » co hoc, co loi
x hoi » xa hoi, o hoi, x ho

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 ky nang ((x hoi) or (co hoi)). hieu van cham ((duc van) or (duc va)) anh dai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (co hoi)). hieu van cham ((duc van) OR (duc va)) anh dai cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((x hoi) or (co hoi)). hieu van cham ((duc van) or (duc va)) anh dai cua vat*.