Perhaps you should try some spelling variations:
nam duoc » nam thuoc, da duoc, dat duoc
ban hanh » ban hang
hieu ve » hieu va, hieu van
kem cua » em cua, keo cua, diem cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
so hoc » co hoc, mo hoc, so hoa
cua cu » cua chu, cua cau, cua su
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((x hoi) or (so hoc)). hieu ve ((nam duoc) or (pham duc)) ban hanh kem cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((x hoi) OR (so hoc)). hieu ve ((nam duoc) OR (pham duc)) ban hanh kem cua cu.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((x hoi) or (so hoc)). hieu ve ((nam duoc) or (pham duc)) ban hanh kem cua cu*.