Perhaps you should try some spelling variations:
chat doc » chat hoc, chau doc, thuat doc
sang lai » sang tai, sang lap, mang lai
hieu so » thieu so
ky sang » ky nang, ky dang, ky tang
lai hoi » dai hoi, lai hoa, lai roi
hieu su » hieu sau, tieu su, hieu suat
va hanh » van hanh, va thanh, va danh
tu sai » tu bai, tu san, tu cai
doc va » duoc va, hoc va, duc va
sai ky » sac ky
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 sai ky sang lai hoi. ((hieu su) or (hieu so)) chat doc va hanh vi ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky sang lai hoi. ((hieu su) OR (hieu so)) chat doc va hanh vi ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: tu sai ky sang lai hoi. ((hieu su) or (hieu so)) chat doc va hanh vi ((cua te) or (cua tu))*.