Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hanh lam » thanh lap, hanh kem, hanh va
xa hanh » xa thanh, xa khanh, va hanh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
bo sach » co sach, hoc sach
ma hoi » mai hoi, ma hoa, me hoi
cac tu » cac thu, cach tu, tac tu
lam ve » la ve, lam vu, nam ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky nang ((ma hoi) or (xa hoi)). hieu ve ((cac tu) or (cac du)) xa hanh lam ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky nang ((ma hoi) OR (xa hoi)). hieu ve ((cac tu) OR (cac du)) xa hanh lam ve triet.
• Adding a wildcard symbol may retrieve word variants: bo sach ky nang ((ma hoi) or (xa hoi)). hieu ve ((cac tu) or (cac du)) xa hanh lam ve triet*.