Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sac » thu sach, thu san, thu xac
hieu va » lieu va, hieu qua
gia duc » giao duc, gia muc, gia thuc
duc ban » duc tan, duc van, dua ban
cuc tre » cua tre, cuu tre, cuc thue
duc tre » duoc tren, duc tien
sac ky » cac ky, sai ky
va gia » va giai
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: thu sac ky nang ((x hoi) OR (xa hoi)). hieu va gia duc ban thanh san ((cuc tre) or (duc tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang ((x hoi) OR (xa hoi)). hieu va gia duc ban thanh san ((cuc tre) OR (duc tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky nang ((x hoi) OR (xa hoi)). hieu va gia duc ban thanh san ((cuc tre) or (duc tre))*".