Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
ban hanh » ban hang
tham duc » pham duc, tham du, than duc
van tham » van thanh, van tuan, van chat
sach thu » sach thieu, sach tham, cach thuc
duc ban » duc tan, duc van, dua ban
lai cua » dai cua, hai cua, lai chau
x hoi » o hoi, x ho, 5 hoi

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 thu) OR (sach thue)) nang ((x hoi) or (xa hoi)). hieu van tham duc ban hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thu) OR (sach thue)) nang ((x hoi) OR (xa hoi)). hieu van tham duc ban hanh lai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach thu) OR (sach thue)) nang ((x hoi) or (xa hoi)). hieu van tham duc ban hanh lai cua viet".
• Adding a wildcard symbol may retrieve word variants: su ((sach thu) OR (sach thue)) nang ((x hoi) or (xa hoi)). hieu van tham duc ban hanh lai cua viet*.