Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
hai cua » thai cua, dai cua, hoi cua
lai cua » dai cua, lai chau, thai cua
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 nang o hoi. hieu ((ve cham) or (vien cac)) duc va hanh ((lai cua) or (hai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang o hoi. hieu ((ve cham) OR (vien cac)) duc va hanh ((lai cua) OR (hai cua)) te.
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang o hoi. hieu ((ve cham) or (vien cac)) duc va hanh ((lai cua) or (hai cua)) te*.