Perhaps you should try some spelling variations:
mang dat » mang dau, hoang dat, hang dau
ky mang » ky nang, ke mang, ky dang
dat hoi » dat thoi, dai hoi, dan hoi
hieu su » hieu sau, tieu su, hieu suat
hieu so » thieu so
va hanh » van hanh, va thanh, va danh
tu bai » tu ban, tu bat, te bai
bai ky » ban ky, sai ky, bac ky
vi cua » vai cua, di cua
cua te » cua tu
su va » su van, tu va

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 dat hoi. ((hieu su) or (hieu so)) cao su va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky mang dat hoi. ((hieu su) OR (hieu so)) cao su va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu bai ky mang dat hoi. ((hieu su) or (hieu so)) cao su va hanh vi cua te*.