Perhaps you should try some spelling variations:
thuc ban » thuoc ban, thuc dan, thu ban
cau treo » cau theo, cau tren, cau triet
ban hanh » ban hang
coc thuc » hoc thuc, doc thuc, co thuc
tu sach » thu sach, su sach, te sach
hanh ve » hanh vi, hanh va, hanh kem
hieu ve » hieu va, hieu van
ve coc » ve cuoc, ve cac, ve co
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
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: tu sach v nang ((x hoi) or (xa hoi)). hieu ve coc thuc ban hanh ve ((cau treo) or (cau thi))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang ((x hoi) OR (xa hoi)). hieu ve coc thuc ban hanh ve ((cau treo) OR (cau thi)).
• Adding a wildcard symbol may retrieve word variants: tu sach v nang ((x hoi) or (xa hoi)). hieu ve coc thuc ban hanh ve ((cau treo) or (cau thi))*.