Perhaps you should try some spelling variations:
hieu sau » hieu suat, tieu su, hieu va
mang lai » mang lam, mang luoi, dang loai
van hanh » van thanh, ban hanh, van anh
ky mang » ky nang, ke mang, ky dang
lai hoi » dai hoi, lai hoa, lai roi
hieu su » tieu su, hieu suat, hieu qua
chao su » cao su, chao xu, achat su
hieu so » thieu so
vi cua » vai cua, di cua
su van » tu van, vu van
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
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 sac ky mang lai hoi. ((((hieu su) OR (hieu sau))) or (hieu so)) chao su van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky mang lai hoi. ((((hieu su) OR (hieu sau))) OR (hieu so)) chao su van hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky mang lai hoi. ((((hieu su) OR (hieu sau))) or (hieu so)) chao su van hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sac ky mang lai hoi. ((((hieu su) OR (hieu sau))) or (hieu so)) chao su van hanh vi cua te*.