Perhaps you should try some spelling variations:
hieu moi » nhiem moi, hieu bo, hieu chi
thanh de » hanh de, thanh ve, thanh do
va thanh » gia thanh, ban thanh, va tinh
kho mang » kho tang, cho mang, pho mang
hieu so » thieu so
tu cach » tu cac
may hoi » may thoi, tay hoi, mai hoi
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu 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 cach) or (su sach)) kho mang may hoi. ((hieu moi) OR (hieu so)) pham duc va thanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) kho mang may hoi. ((hieu moi) OR (hieu so)) pham duc va thanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (su sach)) kho mang may hoi. ((hieu moi) OR (hieu so)) pham duc va thanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) kho mang may hoi. ((hieu moi) OR (hieu so)) pham duc va thanh de cua tre*.