Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
tham duc » pham duc, tham du, than duc
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
su sach » vu sach
so sach » so sanh, bo sach, co sach
duc van » duc va, duc tan, duc manh
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) or (so sach)) thieu nang ((x hoi) or (xa hoi)). hieu van tham duc van hanh lai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) thieu nang ((x hoi) OR (xa hoi)). hieu van tham duc van hanh lai cua vat.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) thieu nang ((x hoi) or (xa hoi)). hieu van tham duc van hanh lai cua vat*.