Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty mang » ty xang, ty hang, tin mang
mang xa » lang xa, mang may, dang xay
hieu ve » hieu van
hieu va » lieu va, hieu qua
lai cua » dai cua, hai cua, lai chau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty mang xa hoi. ((hieu ve) OR (hieu va)) cam ((duc va) or (tuc xa)) hanh lai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty mang xa hoi. ((hieu ve) OR (hieu va)) cam ((duc va) OR (tuc xa)) hanh lai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty mang xa hoi. ((hieu ve) OR (hieu va)) cam ((duc va) or (tuc xa)) hanh lai cua vat".
• Adding a wildcard symbol may retrieve word variants: su sach ty mang xa hoi. ((hieu ve) OR (hieu va)) cam ((duc va) or (tuc xa)) hanh lai cua vat*.