Perhaps you should try some spelling variations:
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
sach thi » sach thu, sach tai, sach thieu
than duc » tran duc, phan duc, than doc
thi nang » thi cong, ki nang, thi hanh
tham du » thap du, tham do, pham duc
lai cua » dai cua, hai cua, lai chau
su sach » so sach, vu sach
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 thi nang ((x hoi) or (xa hoi)). hieu van ((than duc) or (tham du)) ban hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi nang ((x hoi) OR (xa hoi)). hieu van ((than duc) OR (tham du)) ban hanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach thi nang ((x hoi) or (xa hoi)). hieu van ((than duc) or (tham du)) ban hanh lai cua viet*.