Perhaps you should try some spelling variations:
hiem ngheo » giam ngheo, nhiem nghe
ngheo nam » nghe nam, nghiep nam, nghe lam
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
mai hoi » mai khoi, dai hoi, lai hoi
thu xac » thau xay
dinh ba » dinh gia, dinh van, dinh lam
ma hoi » xa hoi, ma hoa, me hoi
ba cua » ban cua, bai cua, bao cua

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 ty tang ((ma hoi) or (mai hoi)). hiem ngheo nam thu xac dinh ba cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty tang ((ma hoi) OR (mai hoi)). hiem ngheo nam thu xac dinh ba cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty tang ((ma hoi) or (mai hoi)). hiem ngheo nam thu xac dinh ba cua triet*.