Perhaps you should try some spelling variations:
lang lai » lang dai, lang hai, lang mai
hieu van » hieu va, thien van, lieu va
ve triet » va trien, su triet
hoc sac » hoc sach, hoc cac, hoc mac
ky lang » ky nang, ky dang, ky tang
lai hoi » dai hoi, lai hoa, lai roi
van cau » van dau, van hau, van chat
duc van » duc tan, duc manh, duc phan
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: hoc sac ky lang lai hoi. hieu van cau ((duc van) or (duc va)) hanh vi ((cua te) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky lang lai hoi. hieu van cau ((duc van) OR (duc va)) hanh vi ((cua te) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: hoc sac ky lang lai hoi. hieu van cau ((duc van) or (duc va)) hanh vi ((cua te) or (ve triet))*.