Perhaps you should try some spelling variations:
hieu sau » hieu su, hieu suat, tieu su
van hanh » van thanh, ban hanh, van anh
sau chat » sat chat, sau chan, soat chat
chat luc » chat xuc, chat lua, nhan luc
ky mang » ky nang, ke mang, ky tang
ky dang » ky nang, ky danh
lai hoi » dai hoi, lai hoa, lai roi
luc van » luoc van, luu van, duc van
tu bai » tu ban, tu bat, te bai
cua tu » cua tuc, cua su, cua cu

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) or (ky dang)) lai hoi. hieu sau chat luc van hanh vi ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ((ky mang) OR (ky dang)) lai hoi. hieu sau chat luc van hanh vi ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: tu bai ((ky mang) or (ky dang)) lai hoi. hieu sau chat luc van hanh vi ((cua te) or (cua tu))*.