Perhaps you should try some spelling variations:
lvan nang » luan nang, va nang, xuan nang
thuoc ban » thuoc tan, thuoc dang, thu ban
cam thuoc » cay thuoc, nam thuoc, lam thuoc
hieu van » hieu va, thien van, lieu va
danh doi » danh di, thanh doi, dung doi
van nang » van quang, van ban, van dong
ban danh » ban doanh, ban hanh, ban dan
so sach » so sanh, co sach, hoc sach
doi cua » dai cua, hoi cua
van cam » van nam, van lam, van cau
bo sach » co sach, hoc sach
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (bo sach)) ((van nang) or (lvan nang)) xa hoi. hieu van cam thuoc ban danh doi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) ((van nang) OR (lvan nang)) xa hoi. hieu van cam thuoc ban danh doi cua tu.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) ((van nang) or (lvan nang)) xa hoi. hieu van cam thuoc ban danh doi cua tu*.