Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
de cua » le cua, te cua, dieu cua
di cua » dai cua, doi cua, do cua
luc va » duc va, tuc va, loc va
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
va cau » van cau, va cac, va dau
ke cau » ket cau
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang x hoi. hieu ((va cau) or (ke cau)) luc va hanh ((di cua) OR (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang x hoi. hieu ((va cau) OR (ke cau)) luc va hanh ((di cua) OR (de cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang x hoi. hieu ((va cau) or (ke cau)) luc va hanh ((di cua) OR (de cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang x hoi. hieu ((va cau) or (ke cau)) luc va hanh ((di cua) OR (de cua)) tre*.