Perhaps you should try some spelling variations:
sach nham » sach nha, sach tham, sach han
nham nang » phap nang, cam nang, kha nang
ve triet » va trien, su triet
hanh lam » thanh lap, hanh kem, hanh va
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va
ma hoi » xa hoi, ma hoa, me hoi
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: tu sach nham nang ((ma hoi) or (mai hoi)). hieu ((ve cam) or (va cac)) luc va hanh lam ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach nham nang ((ma hoi) OR (mai hoi)). hieu ((ve cam) OR (va cac)) luc va hanh lam ve triet.
• Adding a wildcard symbol may retrieve word variants: tu sach nham nang ((ma hoi) or (mai hoi)). hieu ((ve cam) or (va cac)) luc va hanh lam ve triet*.