Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
lang lai » lang dai, lang hai, lang mai
hieu van » hieu va, thien van, lieu va
ve triet » va trien, su triet
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lai hoi » dai hoi, lai hoa, lai roi
van cam » van nam, van lam, van cau
duc van » duc tan, duc manh, duc phan
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 sach ky lang lai hoi. hieu van cam ((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 sach ky lang lai hoi. hieu van cam ((duc van) OR (duc va)) hanh vi ((cua te) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: hoc sach ky lang lai hoi. hieu van cam ((duc van) or (duc va)) hanh vi ((cua te) or (ve triet))*.