Perhaps you should try some spelling variations:
mang dau » hang dau, xang dau, nang dau
hieu sau » hieu suat, tieu su, hieu va
chat huu » pham huu
ky mang » ky nang, ke mang, ky dang
dau hoi » cau hoi, dai hoi, dan hoi
hieu su » tieu su, hieu so, hieu suat
va hanh » van hanh, va thanh, va danh
tu bai » tu ban, tu bat, te bai
bai ky » ban ky, sai ky, bac ky
huu va » cuu va, tuu va
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bai ky mang dau hoi. ((hieu su) or (hieu sau)) chat huu va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky mang dau hoi. ((hieu su) OR (hieu sau)) chat huu va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu bai ky mang dau hoi. ((hieu su) or (hieu sau)) chat huu va hanh vi cua te*.