Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
ban tuan » van tuan, ban quan, ban than
hieu van » hieu va, thien van, lieu va
tuan va » toan va, luan va, quan va
xuc ban » duc ban, cuc ban, quoc ban
van cam » van nam, van lam, van cau
tu sach » thu sach, te sach, tu cach
tu nang » tru nang, tu nong, tu nano
su sach » so sach, vu sach
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ((tu nang) or (truc nano)) xa hoi. hieu van cam xuc ban tuan va cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ((tu nang) OR (truc nano)) xa hoi. hieu van cam xuc ban tuan va cau theo.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ((tu nang) or (truc nano)) xa hoi. hieu van cam xuc ban tuan va cau theo*.